mirror of
https://github.com/QL-Win/QuickLook.git
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Code Cleanup
This commit is contained in:
ema
@@ -1,20 +1,24 @@
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// Copyright © 2018 Paddy Xu
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//
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//
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// This file is part of QuickLook program.
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//
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using QuickLook.Common.Annotations;
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using QuickLook.Common.ExtensionMethods;
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using QuickLook.Common.Helpers;
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using QuickLook.Common.Plugin;
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using System;
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using System.ComponentModel;
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using System.Diagnostics;
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@@ -30,493 +34,489 @@ using System.Windows.Media;
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using System.Windows.Media.Animation;
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using System.Windows.Media.Imaging;
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using System.Windows.Threading;
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using QuickLook.Common.Annotations;
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using QuickLook.Common.ExtensionMethods;
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using QuickLook.Common.Helpers;
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using QuickLook.Common.Plugin;
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namespace QuickLook.Plugin.ImageViewer
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namespace QuickLook.Plugin.ImageViewer;
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/// <summary>
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/// Interaction logic for ImagePanel.xaml
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/// </summary>
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public partial class ImagePanel : UserControl, INotifyPropertyChanged, IDisposable
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{
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/// <summary>
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/// Interaction logic for ImagePanel.xaml
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/// </summary>
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public partial class ImagePanel : UserControl, INotifyPropertyChanged, IDisposable
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private Visibility _backgroundVisibility = Visibility.Visible;
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private ContextObject _contextObject;
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private Point? _dragInitPos;
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private Uri _imageSource;
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private bool _isZoomFactorFirstSet = true;
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private DateTime _lastZoomTime = DateTime.MinValue;
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private double _maxZoomFactor = 3d;
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private MetaProvider _meta;
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private Visibility _metaIconVisibility = Visibility.Visible;
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private double _minZoomFactor = 0.1d;
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private BitmapScalingMode _renderMode = BitmapScalingMode.Linear;
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private bool _showZoomLevelInfo = true;
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private BitmapSource _source;
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private double _zoomFactor = 1d;
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private bool _zoomToFit = true;
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private double _zoomToFitFactor;
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private bool _zoomWithControlKey;
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public ImagePanel()
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{
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private Visibility _backgroundVisibility = Visibility.Visible;
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private ContextObject _contextObject;
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private Point? _dragInitPos;
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private Uri _imageSource;
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private bool _isZoomFactorFirstSet = true;
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private DateTime _lastZoomTime = DateTime.MinValue;
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private double _maxZoomFactor = 3d;
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private MetaProvider _meta;
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private Visibility _metaIconVisibility = Visibility.Visible;
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private double _minZoomFactor = 0.1d;
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private BitmapScalingMode _renderMode = BitmapScalingMode.Linear;
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private bool _showZoomLevelInfo = true;
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private BitmapSource _source;
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private double _zoomFactor = 1d;
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InitializeComponent();
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private bool _zoomToFit = true;
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private double _zoomToFitFactor;
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private bool _zoomWithControlKey;
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Resources.MergedDictionaries.Clear();
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public ImagePanel()
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buttonMeta.Click += (sender, e) =>
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textMeta.Visibility = textMeta.Visibility == Visibility.Collapsed
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? Visibility.Visible
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: Visibility.Collapsed;
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buttonBackgroundColour.Click += OnBackgroundColourOnClick;
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SizeChanged += ImagePanel_SizeChanged;
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viewPanelImage.DoZoomToFit += (sender, e) => DoZoomToFit();
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viewPanelImage.ImageLoaded += (sender, e) => ContextObject.IsBusy = false;
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viewPanel.PreviewMouseWheel += ViewPanel_PreviewMouseWheel;
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viewPanel.MouseLeftButtonDown += ViewPanel_MouseLeftButtonDown;
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viewPanel.MouseMove += ViewPanel_MouseMove;
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viewPanel.MouseDoubleClick += ViewPanel_MouseDoubleClick;
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viewPanel.ManipulationInertiaStarting += ViewPanel_ManipulationInertiaStarting;
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viewPanel.ManipulationStarting += ViewPanel_ManipulationStarting;
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viewPanel.ManipulationDelta += ViewPanel_ManipulationDelta;
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}
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internal ImagePanel(ContextObject context, MetaProvider meta) : this()
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{
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ContextObject = context;
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Meta = meta;
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var s = meta.GetSize();
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//_minZoomFactor = Math.Min(200d / s.Height, 400d / s.Width);
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//_maxZoomFactor = Math.Min(9000d / s.Height, 9000d / s.Width);
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ShowMeta();
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Theme = ContextObject.Theme;
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}
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public bool ZoomWithControlKey
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{
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get => _zoomWithControlKey;
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set
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{
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InitializeComponent();
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Resources.MergedDictionaries.Clear();
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buttonMeta.Click += (sender, e) =>
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textMeta.Visibility = textMeta.Visibility == Visibility.Collapsed
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? Visibility.Visible
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: Visibility.Collapsed;
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buttonBackgroundColour.Click += OnBackgroundColourOnClick;
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SizeChanged += ImagePanel_SizeChanged;
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viewPanelImage.DoZoomToFit += (sender, e) => DoZoomToFit();
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viewPanelImage.ImageLoaded += (sender, e) => ContextObject.IsBusy = false;
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viewPanel.PreviewMouseWheel += ViewPanel_PreviewMouseWheel;
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viewPanel.MouseLeftButtonDown += ViewPanel_MouseLeftButtonDown;
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viewPanel.MouseMove += ViewPanel_MouseMove;
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viewPanel.MouseDoubleClick += ViewPanel_MouseDoubleClick;
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viewPanel.ManipulationInertiaStarting += ViewPanel_ManipulationInertiaStarting;
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viewPanel.ManipulationStarting += ViewPanel_ManipulationStarting;
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viewPanel.ManipulationDelta += ViewPanel_ManipulationDelta;
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}
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internal ImagePanel(ContextObject context, MetaProvider meta) : this()
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{
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ContextObject = context;
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Meta = meta;
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var s = meta.GetSize();
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//_minZoomFactor = Math.Min(200d / s.Height, 400d / s.Width);
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//_maxZoomFactor = Math.Min(9000d / s.Height, 9000d / s.Width);
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ShowMeta();
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Theme = ContextObject.Theme;
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}
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public bool ZoomWithControlKey
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{
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get => _zoomWithControlKey;
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set
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{
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_zoomWithControlKey = value;
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OnPropertyChanged();
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}
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}
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public bool ShowZoomLevelInfo
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{
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get => _showZoomLevelInfo;
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set
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{
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if (value == _showZoomLevelInfo) return;
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_showZoomLevelInfo = value;
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OnPropertyChanged();
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}
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}
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public Themes Theme
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{
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get => ContextObject?.Theme ?? Themes.Dark;
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set
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{
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ContextObject.Theme = value;
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OnPropertyChanged();
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}
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}
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public BitmapScalingMode RenderMode
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{
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get => _renderMode;
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set
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{
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_renderMode = value;
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OnPropertyChanged();
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}
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}
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public bool ZoomToFit
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{
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get => _zoomToFit;
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set
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{
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_zoomToFit = value;
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OnPropertyChanged();
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}
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}
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public Visibility MetaIconVisibility
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{
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get => _metaIconVisibility;
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set
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{
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_metaIconVisibility = value;
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OnPropertyChanged();
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}
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}
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public Visibility BackgroundVisibility
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{
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get => _backgroundVisibility;
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set
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{
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_backgroundVisibility = value;
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OnPropertyChanged();
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}
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}
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public double MinZoomFactor
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{
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get => _minZoomFactor;
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set
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{
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_minZoomFactor = value;
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OnPropertyChanged();
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}
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}
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public double MaxZoomFactor
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{
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get => _maxZoomFactor;
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set
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{
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_maxZoomFactor = value;
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OnPropertyChanged();
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}
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}
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public double ZoomToFitFactor
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{
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get => _zoomToFitFactor;
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private set
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{
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_zoomToFitFactor = value;
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OnPropertyChanged();
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}
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}
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public double ZoomFactor
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{
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get => _zoomFactor;
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private set
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{
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_zoomFactor = value;
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OnPropertyChanged();
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if (_isZoomFactorFirstSet)
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{
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_isZoomFactorFirstSet = false;
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return;
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}
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if (ShowZoomLevelInfo)
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((Storyboard) zoomLevelInfo.FindResource("StoryboardShowZoomLevelInfo")).Begin();
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}
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}
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public Uri ImageUriSource
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{
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get => _imageSource;
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set
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{
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_imageSource = value;
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OnPropertyChanged();
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}
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}
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public BitmapSource Source
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{
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get => _source;
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set
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{
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_source = value;
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OnPropertyChanged();
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if (ImageUriSource == null)
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viewPanelImage.Source = _source;
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}
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}
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public ContextObject ContextObject
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{
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get => _contextObject;
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set
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{
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_contextObject = value;
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OnPropertyChanged();
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}
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}
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public MetaProvider Meta
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{
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get => _meta;
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set
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{
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if (Equals(value, _meta)) return;
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_meta = value;
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OnPropertyChanged();
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}
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}
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public void Dispose()
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{
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viewPanelImage?.Dispose();
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viewPanelImage = null;
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}
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public event PropertyChangedEventHandler PropertyChanged;
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private void OnBackgroundColourOnClick(object sender, RoutedEventArgs e)
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{
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Theme = Theme == Themes.Dark ? Themes.Light : Themes.Dark;
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SettingHelper.Set("LastTheme", (int) Theme, "QuickLook.Plugin.ImageViewer");
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}
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private void ShowMeta()
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{
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textMeta.Inlines.Clear();
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Meta.GetExif().Values.ForEach(m =>
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{
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if (string.IsNullOrWhiteSpace(m.Item1) || string.IsNullOrWhiteSpace(m.Item2))
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return;
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textMeta.Inlines.Add(new Run(m.Item1) {FontWeight = FontWeights.SemiBold});
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textMeta.Inlines.Add(": ");
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textMeta.Inlines.Add(m.Item2);
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textMeta.Inlines.Add("\r\n");
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});
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textMeta.Inlines.Remove(textMeta.Inlines.LastInline);
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if (!textMeta.Inlines.Any())
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MetaIconVisibility = Visibility.Collapsed;
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}
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public event EventHandler<int> ImageScrolled;
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public event EventHandler ZoomChanged;
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private void ImagePanel_SizeChanged(object sender, SizeChangedEventArgs e)
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{
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UpdateZoomToFitFactor();
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if (ZoomToFit)
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DoZoomToFit();
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}
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private void ViewPanel_ManipulationInertiaStarting(object sender, ManipulationInertiaStartingEventArgs e)
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{
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e.TranslationBehavior = new InertiaTranslationBehavior
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{
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InitialVelocity = e.InitialVelocities.LinearVelocity,
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DesiredDeceleration = 10.0 * 96.0 / (1000.0 * 1000.0)
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};
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}
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private void ViewPanel_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
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{
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e.ManipulationContainer = viewPanel;
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e.Mode = ManipulationModes.Scale | ManipulationModes.Translate;
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}
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private void ViewPanel_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
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{
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var delta = e.DeltaManipulation;
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var newZoom = ZoomFactor + ZoomFactor * (delta.Scale.X - 1);
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Zoom(newZoom);
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viewPanel.ScrollToHorizontalOffset(viewPanel.HorizontalOffset - delta.Translation.X);
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viewPanel.ScrollToVerticalOffset(viewPanel.VerticalOffset - delta.Translation.Y);
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e.Handled = true;
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}
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private void ViewPanel_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
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{
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e.MouseDevice.Capture(viewPanel);
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_dragInitPos = e.GetPosition(viewPanel);
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var temp = _dragInitPos.Value; // Point is a type value
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temp.Offset(viewPanel.HorizontalOffset, viewPanel.VerticalOffset);
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_dragInitPos = temp;
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}
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private void ViewPanel_MouseDoubleClick(object sender, MouseButtonEventArgs e)
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{
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DoZoomToFit();
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}
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private void ViewPanel_MouseMove(object sender, MouseEventArgs e)
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{
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if (!_dragInitPos.HasValue)
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return;
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if (e.LeftButton == MouseButtonState.Released)
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{
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e.MouseDevice.Capture(null);
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_dragInitPos = null;
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return;
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}
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e.Handled = true;
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var delta = _dragInitPos.Value - e.GetPosition(viewPanel);
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viewPanel.ScrollToHorizontalOffset(delta.X);
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viewPanel.ScrollToVerticalOffset(delta.Y);
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}
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private void ViewPanel_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
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{
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e.Handled = true;
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// normal scroll when Control is not pressed, useful for PdfViewer
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if (ZoomWithControlKey && (Keyboard.Modifiers & ModifierKeys.Control) == 0)
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{
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viewPanel.ScrollToVerticalOffset(viewPanel.VerticalOffset - e.Delta);
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ImageScrolled?.Invoke(this, e.Delta);
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return;
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}
|
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|
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// otherwise, perform normal zooming
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var newZoom = ZoomFactor + ZoomFactor * e.Delta / 120 * 0.1;
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Zoom(newZoom);
|
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}
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public Size GetScrollSize()
|
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{
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return new Size(viewPanel.ScrollableWidth, viewPanel.ScrollableHeight);
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}
|
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|
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public Point GetScrollPosition()
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{
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return new Point(viewPanel.HorizontalOffset, viewPanel.VerticalOffset);
|
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}
|
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|
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public void SetScrollPosition(Point point)
|
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{
|
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viewPanel.ScrollToHorizontalOffset(point.X);
|
||||
viewPanel.ScrollToVerticalOffset(point.Y);
|
||||
}
|
||||
|
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public void DoZoomToFit()
|
||||
{
|
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UpdateZoomToFitFactor();
|
||||
|
||||
Zoom(ZoomToFitFactor, false, true);
|
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}
|
||||
|
||||
private void UpdateZoomToFitFactor()
|
||||
{
|
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if (viewPanelImage?.Source == null)
|
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{
|
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ZoomToFitFactor = 1d;
|
||||
return;
|
||||
}
|
||||
|
||||
var factor = Math.Min(viewPanel.ActualWidth / viewPanelImage.Source.Width,
|
||||
viewPanel.ActualHeight / viewPanelImage.Source.Height);
|
||||
|
||||
ZoomToFitFactor = factor;
|
||||
}
|
||||
|
||||
public void ResetZoom()
|
||||
{
|
||||
ZoomToFitFactor = 1;
|
||||
Zoom(1d, true, ZoomToFit);
|
||||
}
|
||||
|
||||
public void Zoom(double factor, bool suppressEvent = false, bool isToFit = false)
|
||||
{
|
||||
if (viewPanelImage?.Source == null)
|
||||
return;
|
||||
|
||||
// pause when fit width
|
||||
if (ZoomFactor < ZoomToFitFactor && factor > ZoomToFitFactor
|
||||
|| ZoomFactor > ZoomToFitFactor && factor < ZoomToFitFactor)
|
||||
{
|
||||
factor = ZoomToFitFactor;
|
||||
ZoomToFit = true;
|
||||
}
|
||||
// pause when 100%
|
||||
else if (ZoomFactor < 1 && factor > 1 || ZoomFactor > 1 && factor < 1)
|
||||
{
|
||||
factor = 1;
|
||||
ZoomToFit = false;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!isToFit)
|
||||
ZoomToFit = false;
|
||||
}
|
||||
|
||||
factor = Math.Max(factor, MinZoomFactor);
|
||||
factor = Math.Min(factor, MaxZoomFactor);
|
||||
|
||||
ZoomFactor = factor;
|
||||
|
||||
var position = ZoomToFit
|
||||
? new Point(viewPanelImage.Source.Width / 2, viewPanelImage.Source.Height / 2)
|
||||
: Mouse.GetPosition(viewPanelImage);
|
||||
|
||||
viewPanelImage.LayoutTransform = new ScaleTransform(factor, factor);
|
||||
|
||||
viewPanel.InvalidateMeasure();
|
||||
|
||||
// critical for calculating offset
|
||||
viewPanel.ScrollToHorizontalOffset(0);
|
||||
viewPanel.ScrollToVerticalOffset(0);
|
||||
UpdateLayout();
|
||||
|
||||
var offset = viewPanelImage.TranslatePoint(position, viewPanel) - Mouse.GetPosition(viewPanel);
|
||||
viewPanel.ScrollToHorizontalOffset(offset.X);
|
||||
viewPanel.ScrollToVerticalOffset(offset.Y);
|
||||
UpdateLayout();
|
||||
|
||||
if (!suppressEvent)
|
||||
FireZoomChangedEvent();
|
||||
}
|
||||
|
||||
private void FireZoomChangedEvent()
|
||||
{
|
||||
_lastZoomTime = DateTime.Now;
|
||||
|
||||
Task.Delay(500).ContinueWith(t =>
|
||||
{
|
||||
if (DateTime.Now - _lastZoomTime < TimeSpan.FromSeconds(0.5))
|
||||
return;
|
||||
|
||||
Debug.WriteLine($"FireZoomChangedEvent fired: {Thread.CurrentThread.ManagedThreadId}");
|
||||
|
||||
Dispatcher.BeginInvoke(new Action(() => ZoomChanged?.Invoke(this, new EventArgs())),
|
||||
DispatcherPriority.Background);
|
||||
});
|
||||
}
|
||||
|
||||
[NotifyPropertyChangedInvocator]
|
||||
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
|
||||
{
|
||||
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
|
||||
}
|
||||
|
||||
public void ScrollToTop()
|
||||
{
|
||||
viewPanel.ScrollToTop();
|
||||
}
|
||||
|
||||
public void ScrollToBottom()
|
||||
{
|
||||
viewPanel.ScrollToBottom();
|
||||
_zoomWithControlKey = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
public bool ShowZoomLevelInfo
|
||||
{
|
||||
get => _showZoomLevelInfo;
|
||||
set
|
||||
{
|
||||
if (value == _showZoomLevelInfo) return;
|
||||
_showZoomLevelInfo = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public Themes Theme
|
||||
{
|
||||
get => ContextObject?.Theme ?? Themes.Dark;
|
||||
set
|
||||
{
|
||||
ContextObject.Theme = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public BitmapScalingMode RenderMode
|
||||
{
|
||||
get => _renderMode;
|
||||
set
|
||||
{
|
||||
_renderMode = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public bool ZoomToFit
|
||||
{
|
||||
get => _zoomToFit;
|
||||
set
|
||||
{
|
||||
_zoomToFit = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public Visibility MetaIconVisibility
|
||||
{
|
||||
get => _metaIconVisibility;
|
||||
set
|
||||
{
|
||||
_metaIconVisibility = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public Visibility BackgroundVisibility
|
||||
{
|
||||
get => _backgroundVisibility;
|
||||
set
|
||||
{
|
||||
_backgroundVisibility = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public double MinZoomFactor
|
||||
{
|
||||
get => _minZoomFactor;
|
||||
set
|
||||
{
|
||||
_minZoomFactor = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public double MaxZoomFactor
|
||||
{
|
||||
get => _maxZoomFactor;
|
||||
set
|
||||
{
|
||||
_maxZoomFactor = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public double ZoomToFitFactor
|
||||
{
|
||||
get => _zoomToFitFactor;
|
||||
private set
|
||||
{
|
||||
_zoomToFitFactor = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public double ZoomFactor
|
||||
{
|
||||
get => _zoomFactor;
|
||||
private set
|
||||
{
|
||||
_zoomFactor = value;
|
||||
OnPropertyChanged();
|
||||
|
||||
if (_isZoomFactorFirstSet)
|
||||
{
|
||||
_isZoomFactorFirstSet = false;
|
||||
return;
|
||||
}
|
||||
|
||||
if (ShowZoomLevelInfo)
|
||||
((Storyboard)zoomLevelInfo.FindResource("StoryboardShowZoomLevelInfo")).Begin();
|
||||
}
|
||||
}
|
||||
|
||||
public Uri ImageUriSource
|
||||
{
|
||||
get => _imageSource;
|
||||
set
|
||||
{
|
||||
_imageSource = value;
|
||||
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public BitmapSource Source
|
||||
{
|
||||
get => _source;
|
||||
set
|
||||
{
|
||||
_source = value;
|
||||
OnPropertyChanged();
|
||||
|
||||
if (ImageUriSource == null)
|
||||
viewPanelImage.Source = _source;
|
||||
}
|
||||
}
|
||||
|
||||
public ContextObject ContextObject
|
||||
{
|
||||
get => _contextObject;
|
||||
set
|
||||
{
|
||||
_contextObject = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public MetaProvider Meta
|
||||
{
|
||||
get => _meta;
|
||||
set
|
||||
{
|
||||
if (Equals(value, _meta)) return;
|
||||
_meta = value;
|
||||
OnPropertyChanged();
|
||||
}
|
||||
}
|
||||
|
||||
public void Dispose()
|
||||
{
|
||||
viewPanelImage?.Dispose();
|
||||
viewPanelImage = null;
|
||||
}
|
||||
|
||||
public event PropertyChangedEventHandler PropertyChanged;
|
||||
|
||||
private void OnBackgroundColourOnClick(object sender, RoutedEventArgs e)
|
||||
{
|
||||
Theme = Theme == Themes.Dark ? Themes.Light : Themes.Dark;
|
||||
|
||||
SettingHelper.Set("LastTheme", (int)Theme, "QuickLook.Plugin.ImageViewer");
|
||||
}
|
||||
|
||||
private void ShowMeta()
|
||||
{
|
||||
textMeta.Inlines.Clear();
|
||||
Meta.GetExif().Values.ForEach(m =>
|
||||
{
|
||||
if (string.IsNullOrWhiteSpace(m.Item1) || string.IsNullOrWhiteSpace(m.Item2))
|
||||
return;
|
||||
|
||||
textMeta.Inlines.Add(new Run(m.Item1) { FontWeight = FontWeights.SemiBold });
|
||||
textMeta.Inlines.Add(": ");
|
||||
textMeta.Inlines.Add(m.Item2);
|
||||
textMeta.Inlines.Add("\r\n");
|
||||
});
|
||||
textMeta.Inlines.Remove(textMeta.Inlines.LastInline);
|
||||
if (!textMeta.Inlines.Any())
|
||||
MetaIconVisibility = Visibility.Collapsed;
|
||||
}
|
||||
|
||||
public event EventHandler<int> ImageScrolled;
|
||||
|
||||
public event EventHandler ZoomChanged;
|
||||
|
||||
private void ImagePanel_SizeChanged(object sender, SizeChangedEventArgs e)
|
||||
{
|
||||
UpdateZoomToFitFactor();
|
||||
|
||||
if (ZoomToFit)
|
||||
DoZoomToFit();
|
||||
}
|
||||
|
||||
private void ViewPanel_ManipulationInertiaStarting(object sender, ManipulationInertiaStartingEventArgs e)
|
||||
{
|
||||
e.TranslationBehavior = new InertiaTranslationBehavior
|
||||
{
|
||||
InitialVelocity = e.InitialVelocities.LinearVelocity,
|
||||
DesiredDeceleration = 10.0 * 96.0 / (1000.0 * 1000.0)
|
||||
};
|
||||
}
|
||||
|
||||
private void ViewPanel_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
|
||||
{
|
||||
e.ManipulationContainer = viewPanel;
|
||||
e.Mode = ManipulationModes.Scale | ManipulationModes.Translate;
|
||||
}
|
||||
|
||||
private void ViewPanel_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
|
||||
{
|
||||
var delta = e.DeltaManipulation;
|
||||
|
||||
var newZoom = ZoomFactor + ZoomFactor * (delta.Scale.X - 1);
|
||||
|
||||
Zoom(newZoom);
|
||||
|
||||
viewPanel.ScrollToHorizontalOffset(viewPanel.HorizontalOffset - delta.Translation.X);
|
||||
viewPanel.ScrollToVerticalOffset(viewPanel.VerticalOffset - delta.Translation.Y);
|
||||
|
||||
e.Handled = true;
|
||||
}
|
||||
|
||||
private void ViewPanel_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
|
||||
{
|
||||
e.MouseDevice.Capture(viewPanel);
|
||||
|
||||
_dragInitPos = e.GetPosition(viewPanel);
|
||||
var temp = _dragInitPos.Value; // Point is a type value
|
||||
temp.Offset(viewPanel.HorizontalOffset, viewPanel.VerticalOffset);
|
||||
_dragInitPos = temp;
|
||||
}
|
||||
|
||||
private void ViewPanel_MouseDoubleClick(object sender, MouseButtonEventArgs e)
|
||||
{
|
||||
DoZoomToFit();
|
||||
}
|
||||
|
||||
private void ViewPanel_MouseMove(object sender, MouseEventArgs e)
|
||||
{
|
||||
if (!_dragInitPos.HasValue)
|
||||
return;
|
||||
|
||||
if (e.LeftButton == MouseButtonState.Released)
|
||||
{
|
||||
e.MouseDevice.Capture(null);
|
||||
|
||||
_dragInitPos = null;
|
||||
return;
|
||||
}
|
||||
|
||||
e.Handled = true;
|
||||
|
||||
var delta = _dragInitPos.Value - e.GetPosition(viewPanel);
|
||||
|
||||
viewPanel.ScrollToHorizontalOffset(delta.X);
|
||||
viewPanel.ScrollToVerticalOffset(delta.Y);
|
||||
}
|
||||
|
||||
private void ViewPanel_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
|
||||
{
|
||||
e.Handled = true;
|
||||
|
||||
// normal scroll when Control is not pressed, useful for PdfViewer
|
||||
if (ZoomWithControlKey && (Keyboard.Modifiers & ModifierKeys.Control) == 0)
|
||||
{
|
||||
viewPanel.ScrollToVerticalOffset(viewPanel.VerticalOffset - e.Delta);
|
||||
ImageScrolled?.Invoke(this, e.Delta);
|
||||
return;
|
||||
}
|
||||
|
||||
// otherwise, perform normal zooming
|
||||
var newZoom = ZoomFactor + ZoomFactor * e.Delta / 120 * 0.1;
|
||||
|
||||
Zoom(newZoom);
|
||||
}
|
||||
|
||||
public Size GetScrollSize()
|
||||
{
|
||||
return new Size(viewPanel.ScrollableWidth, viewPanel.ScrollableHeight);
|
||||
}
|
||||
|
||||
public Point GetScrollPosition()
|
||||
{
|
||||
return new Point(viewPanel.HorizontalOffset, viewPanel.VerticalOffset);
|
||||
}
|
||||
|
||||
public void SetScrollPosition(Point point)
|
||||
{
|
||||
viewPanel.ScrollToHorizontalOffset(point.X);
|
||||
viewPanel.ScrollToVerticalOffset(point.Y);
|
||||
}
|
||||
|
||||
public void DoZoomToFit()
|
||||
{
|
||||
UpdateZoomToFitFactor();
|
||||
|
||||
Zoom(ZoomToFitFactor, false, true);
|
||||
}
|
||||
|
||||
private void UpdateZoomToFitFactor()
|
||||
{
|
||||
if (viewPanelImage?.Source == null)
|
||||
{
|
||||
ZoomToFitFactor = 1d;
|
||||
return;
|
||||
}
|
||||
|
||||
var factor = Math.Min(viewPanel.ActualWidth / viewPanelImage.Source.Width,
|
||||
viewPanel.ActualHeight / viewPanelImage.Source.Height);
|
||||
|
||||
ZoomToFitFactor = factor;
|
||||
}
|
||||
|
||||
public void ResetZoom()
|
||||
{
|
||||
ZoomToFitFactor = 1;
|
||||
Zoom(1d, true, ZoomToFit);
|
||||
}
|
||||
|
||||
public void Zoom(double factor, bool suppressEvent = false, bool isToFit = false)
|
||||
{
|
||||
if (viewPanelImage?.Source == null)
|
||||
return;
|
||||
|
||||
// pause when fit width
|
||||
if (ZoomFactor < ZoomToFitFactor && factor > ZoomToFitFactor
|
||||
|| ZoomFactor > ZoomToFitFactor && factor < ZoomToFitFactor)
|
||||
{
|
||||
factor = ZoomToFitFactor;
|
||||
ZoomToFit = true;
|
||||
}
|
||||
// pause when 100%
|
||||
else if (ZoomFactor < 1 && factor > 1 || ZoomFactor > 1 && factor < 1)
|
||||
{
|
||||
factor = 1;
|
||||
ZoomToFit = false;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (!isToFit)
|
||||
ZoomToFit = false;
|
||||
}
|
||||
|
||||
factor = Math.Max(factor, MinZoomFactor);
|
||||
factor = Math.Min(factor, MaxZoomFactor);
|
||||
|
||||
ZoomFactor = factor;
|
||||
|
||||
var position = ZoomToFit
|
||||
? new Point(viewPanelImage.Source.Width / 2, viewPanelImage.Source.Height / 2)
|
||||
: Mouse.GetPosition(viewPanelImage);
|
||||
|
||||
viewPanelImage.LayoutTransform = new ScaleTransform(factor, factor);
|
||||
|
||||
viewPanel.InvalidateMeasure();
|
||||
|
||||
// critical for calculating offset
|
||||
viewPanel.ScrollToHorizontalOffset(0);
|
||||
viewPanel.ScrollToVerticalOffset(0);
|
||||
UpdateLayout();
|
||||
|
||||
var offset = viewPanelImage.TranslatePoint(position, viewPanel) - Mouse.GetPosition(viewPanel);
|
||||
viewPanel.ScrollToHorizontalOffset(offset.X);
|
||||
viewPanel.ScrollToVerticalOffset(offset.Y);
|
||||
UpdateLayout();
|
||||
|
||||
if (!suppressEvent)
|
||||
FireZoomChangedEvent();
|
||||
}
|
||||
|
||||
private void FireZoomChangedEvent()
|
||||
{
|
||||
_lastZoomTime = DateTime.Now;
|
||||
|
||||
Task.Delay(500).ContinueWith(t =>
|
||||
{
|
||||
if (DateTime.Now - _lastZoomTime < TimeSpan.FromSeconds(0.5))
|
||||
return;
|
||||
|
||||
Debug.WriteLine($"FireZoomChangedEvent fired: {Thread.CurrentThread.ManagedThreadId}");
|
||||
|
||||
Dispatcher.BeginInvoke(new Action(() => ZoomChanged?.Invoke(this, new EventArgs())),
|
||||
DispatcherPriority.Background);
|
||||
});
|
||||
}
|
||||
|
||||
[NotifyPropertyChangedInvocator]
|
||||
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
|
||||
{
|
||||
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
|
||||
}
|
||||
|
||||
public void ScrollToTop()
|
||||
{
|
||||
viewPanel.ScrollToTop();
|
||||
}
|
||||
|
||||
public void ScrollToBottom()
|
||||
{
|
||||
viewPanel.ScrollToBottom();
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user