524 lines
14 KiB
C#
524 lines
14 KiB
C#
using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Windows.Forms;
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namespace EveOPreview.UI
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{
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public partial class ThumbnailView : Form, IThumbnailView
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{
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#region Private fields
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private readonly ThumbnailOverlay _overlay;
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// Part of the logic (namely current size / position management)
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// was moved to the view due to the performance reasons
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private bool _isThumbnailSetUp;
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private bool _isOverlayVisible;
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private bool _isTopMost;
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private bool _isPositionChanged;
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private bool _isSizeChanged;
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private bool _isCustomMouseModeActive;
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private DateTime _suppressResizeEventsTimestamp;
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private DWM_THUMBNAIL_PROPERTIES _thumbnail;
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private IntPtr _thumbnailHandle;
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private Size _baseZoomSize;
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private Point _baseZoomLocation;
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private Point _baseMousePosition;
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private Size _baseZoomMaximumSize;
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private HotkeyHandler _hotkeyHandler;
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#endregion
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public ThumbnailView()
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{
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this.IsEnabled = true;
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this.IsActive = false;
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this.IsOverlayEnabled = false;
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this._isThumbnailSetUp = false;
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this._isOverlayVisible = false;
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this._isTopMost = false;
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this._isPositionChanged = true;
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this._isSizeChanged = true;
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this._isCustomMouseModeActive = false;
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this._suppressResizeEventsTimestamp = DateTime.UtcNow;
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InitializeComponent();
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this._overlay = new ThumbnailOverlay(this, this.MouseDown_Handler);
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}
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public IntPtr Id { get; set; }
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public string Title
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{
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get
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{
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return this.Text;
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}
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set
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{
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this.Text = value;
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this._overlay.SetOverlayLabel(value);
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}
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}
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public bool IsEnabled { get; set; }
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public bool IsActive { get; set; }
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public bool IsOverlayEnabled { get; set; }
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public Point ThumbnailLocation
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{
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get
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{
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return this.Location;
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}
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set
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{
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if ((value.X > 0) || (value.Y > 0))
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{
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this.StartPosition = FormStartPosition.Manual;
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}
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this.Location = value;
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}
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}
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public Size ThumbnailSize
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{
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get
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{
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return this.ClientSize;
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}
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set
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{
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this.ClientSize = value;
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}
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}
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public Action<IntPtr> ThumbnailResized { get; set; }
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public Action<IntPtr> ThumbnailMoved { get; set; }
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public Action<IntPtr> ThumbnailFocused { get; set; }
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public Action<IntPtr> ThumbnailLostFocus { get; set; }
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public Action<IntPtr> ThumbnailActivated { get; set; }
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public new void Show()
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{
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base.Show();
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this._isPositionChanged = true;
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this._isSizeChanged = true;
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this._isOverlayVisible = false;
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// Thumbnail will be properly registered during the Manager's Refresh cycle
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this.Refresh();
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this.IsActive = true;
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}
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public new void Hide()
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{
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this.IsActive = false;
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this._overlay.Hide();
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base.Hide();
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}
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public new void Close()
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{
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this.IsActive = false;
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this.UnregisterThumbnail(this._thumbnailHandle);
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this._overlay.Close();
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base.Close();
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}
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// This method is used to determine if the provided Handle is related to client or its thumbnail
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public bool IsKnownHandle(IntPtr handle)
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{
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return (this.Id == handle) || (this.Handle == handle) || (this._overlay.Handle == handle);
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}
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public void SetSizeLimitations(Size minimumSize, Size maximumSize)
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{
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this.MinimumSize = minimumSize;
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this.MaximumSize = maximumSize;
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}
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public void SetOpacity(double opacity)
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{
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this.Opacity = opacity;
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// Overlay opacity settings
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// Of the thumbnail's opacity is almost full then set the overlay's one to
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// full. Otherwise set it to half of the thumnail opacity
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// Opacity value is stored even if the overlay is not displayed atm
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this._overlay.Opacity = this.Opacity > 0.9 ? 1.0 : 1.0 - (1.0 - this.Opacity) / 2;
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}
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public void SetFrames(bool enable)
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{
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FormBorderStyle style = enable ? FormBorderStyle.SizableToolWindow : FormBorderStyle.None;
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// No need to change the borders style if it is ALREADY correct
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if (this.FormBorderStyle == style)
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{
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return;
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}
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// Fix for WinForms issue with the Resize event being fired with inconsistent ClientSize value
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// Any Resize events fired before this timestamp will be ignored
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this._suppressResizeEventsTimestamp = DateTime.UtcNow.AddMilliseconds(450);
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this.FormBorderStyle = style;
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// Notify about possible contents position change
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this._isSizeChanged = true;
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}
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public void SetTopMost(bool enableTopmost)
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{
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// IMO WinForms could check this too
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if (this._isTopMost == enableTopmost)
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{
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return;
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}
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this.TopMost = enableTopmost;
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this._overlay.TopMost = enableTopmost;
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this._isTopMost = enableTopmost;
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}
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public void SetHighlight(bool enabled, Color color)
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{
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this._overlay.EnableHighlight(enabled, color);
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}
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public void ZoomIn(ViewZoomAnchor anchor, int zoomFactor)
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{
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int oldWidth = this._baseZoomSize.Width;
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int oldHeight = this._baseZoomSize.Height;
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int locationX = this.Location.X;
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int locationY = this.Location.Y;
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int newWidth = (zoomFactor * this.ClientSize.Width) + (this.Size.Width - this.ClientSize.Width);
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int newHeight = (zoomFactor * this.ClientSize.Height) + (this.Size.Height - this.ClientSize.Height);
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// First change size, THEN move the window
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// Otherwise there is a chance to fail in a loop
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// Zoom requied -> Moved the windows 1st -> Focus is lost -> Window is moved back -> Focus is back on -> Zoom required -> ...
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this.MaximumSize = new Size(0, 0);
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this.Size = new Size(newWidth, newHeight);
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switch (anchor)
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{
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case ViewZoomAnchor.NW:
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break;
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case ViewZoomAnchor.N:
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this.Location = new Point(locationX - newWidth / 2 + oldWidth / 2, locationY);
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break;
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case ViewZoomAnchor.NE:
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this.Location = new Point(locationX - newWidth + oldWidth, locationY);
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break;
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case ViewZoomAnchor.W:
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this.Location = new Point(locationX, locationY - newHeight / 2 + oldHeight / 2);
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break;
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case ViewZoomAnchor.C:
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this.Location = new Point(locationX - newWidth / 2 + oldWidth / 2, locationY - newHeight / 2 + oldHeight / 2);
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break;
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case ViewZoomAnchor.E:
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this.Location = new Point(locationX - newWidth + oldWidth, locationY - newHeight / 2 + oldHeight / 2);
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break;
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case ViewZoomAnchor.SW:
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this.Location = new Point(locationX, locationY - newHeight + this._baseZoomSize.Height);
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break;
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case ViewZoomAnchor.S:
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this.Location = new Point(locationX - newWidth / 2 + oldWidth / 2, locationY - newHeight + oldHeight);
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break;
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case ViewZoomAnchor.SE:
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this.Location = new Point(locationX - newWidth + oldWidth, locationY - newHeight + oldHeight);
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break;
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}
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}
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public void ZoomOut()
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{
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this.RestoreWindowSizeAndLocation();
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}
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public void RegisterHotkey(Keys hotkey)
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{
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if (this._hotkeyHandler != null)
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{
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this.UnregisterHotkey();
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}
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if (hotkey == Keys.None)
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{
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return;
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}
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this._hotkeyHandler = new HotkeyHandler(this.Handle, hotkey);
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this._hotkeyHandler.Pressed += HotkeyPressed_Handler;
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try
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{
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this._hotkeyHandler.Register();
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}
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catch (Exception)
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{
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// There can be a lot of possible exception reasons here
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// In case of any of them the hotkey setting is silently ignored
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}
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}
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public void UnregisterHotkey()
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{
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if (this._hotkeyHandler == null)
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{
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return;
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}
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this._hotkeyHandler.Unregister();
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this._hotkeyHandler.Pressed -= HotkeyPressed_Handler;
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this._hotkeyHandler.Dispose();
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this._hotkeyHandler = null;
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}
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public void Refresh(bool forceRefresh)
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{
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// To prevent flickering the old broken thumbnail is removed AFTER the new shiny one is created
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IntPtr obsoleteThumbnailHanlde = forceRefresh ? this._thumbnailHandle : IntPtr.Zero;
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if ((this._isThumbnailSetUp == false) || forceRefresh)
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{
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this.RegisterThumbnail();
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}
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bool sizeChanged = this._isSizeChanged || forceRefresh;
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bool locationChanged = this._isPositionChanged || forceRefresh;
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if (sizeChanged)
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{
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this._thumbnail.rcDestination = new RECT(0, 0, this.ClientSize.Width, this.ClientSize.Height);
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try
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{
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WindowManagerNativeMethods.DwmUpdateThumbnailProperties(this._thumbnailHandle, this._thumbnail);
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}
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catch (ArgumentException)
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{
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//This exception will be thrown if the EVE client disappears while this method is running
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}
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this._isSizeChanged = false;
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}
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if (obsoleteThumbnailHanlde != IntPtr.Zero)
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{
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this.UnregisterThumbnail(obsoleteThumbnailHanlde);
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}
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this._overlay.EnableOverlayLabel(this.IsOverlayEnabled);
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if (!this._isOverlayVisible)
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{
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// One-time action to show the Overlay before it is set up
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// Otherwise its position won't be set
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this._overlay.Show();
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this._isOverlayVisible = true;
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}
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else
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{
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if (!(sizeChanged || locationChanged))
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{
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// No need to adjust in the overlay location if it is already visible and properly set
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return;
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}
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}
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Size overlaySize = this.ClientSize;
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Point overlayLocation = this.Location;
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overlayLocation.X += (this.Size.Width - this.ClientSize.Width) / 2;
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overlayLocation.Y += (this.Size.Height - this.ClientSize.Height) - (this.Size.Width - this.ClientSize.Width) / 2;
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this._isPositionChanged = false;
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this._overlay.Size = overlaySize;
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this._overlay.Location = overlayLocation;
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this._overlay.Refresh();
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}
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#region GUI events
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protected override CreateParams CreateParams
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{
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get
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{
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var Params = base.CreateParams;
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Params.ExStyle |= (int)WindowManagerNativeMethods.WS_EX_TOOLWINDOW;
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return Params;
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}
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}
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private void Move_Handler(object sender, EventArgs e)
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{
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this._isPositionChanged = true;
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this.ThumbnailMoved?.Invoke(this.Id);
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}
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private void Resize_Handler(object sender, EventArgs e)
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{
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if (DateTime.UtcNow < this._suppressResizeEventsTimestamp)
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{
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return;
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}
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this._isSizeChanged = true;
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this.ThumbnailResized?.Invoke(this.Id);
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}
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private void MouseEnter_Handler(object sender, EventArgs e)
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{
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this.ExitCustomMouseMode();
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this.SaveWindowSizeAndLocation();
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this.ThumbnailFocused?.Invoke(this.Id);
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}
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private void MouseLeave_Handler(object sender, EventArgs e)
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{
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this.ThumbnailLostFocus?.Invoke(this.Id);
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}
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private void MouseDown_Handler(object sender, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Left)
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{
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this.ThumbnailActivated?.Invoke(this.Id);
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}
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if ((e.Button == MouseButtons.Right) || (e.Button == (MouseButtons.Left | MouseButtons.Right)))
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{
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this.EnterCustomMouseMode();
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}
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}
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private void MouseMove_Handler(object sender, MouseEventArgs e)
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{
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if (this._isCustomMouseModeActive)
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{
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this.ProcessCustomMouseMode(e.Button.HasFlag(MouseButtons.Left), e.Button.HasFlag(MouseButtons.Right));
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}
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}
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private void MouseUp_Handler(object sender, MouseEventArgs e)
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{
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if (e.Button == MouseButtons.Right)
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{
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this.ExitCustomMouseMode();
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}
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}
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private void HotkeyPressed_Handler(object sender, HandledEventArgs e)
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{
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this.ThumbnailActivated?.Invoke(this.Id);
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e.Handled = true;
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}
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#endregion
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#region Thumbnail management
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private void RegisterThumbnail()
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{
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this._thumbnailHandle = WindowManagerNativeMethods.DwmRegisterThumbnail(this.Handle, this.Id);
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this._thumbnail = new DWM_THUMBNAIL_PROPERTIES();
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this._thumbnail.dwFlags = DWM_TNP_CONSTANTS.DWM_TNP_VISIBLE
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+ DWM_TNP_CONSTANTS.DWM_TNP_OPACITY
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+ DWM_TNP_CONSTANTS.DWM_TNP_RECTDESTINATION
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+ DWM_TNP_CONSTANTS.DWM_TNP_SOURCECLIENTAREAONLY;
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this._thumbnail.opacity = 255;
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this._thumbnail.fVisible = true;
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this._thumbnail.fSourceClientAreaOnly = true;
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this._isThumbnailSetUp = true;
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}
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private void UnregisterThumbnail(IntPtr thumbnailHandle)
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{
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try
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{
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WindowManagerNativeMethods.DwmUnregisterThumbnail(thumbnailHandle);
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}
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catch (ArgumentException)
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{
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}
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}
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#endregion
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#region Custom Mouse mode
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// This pair of methods saves/restores certain window propeties
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// Methods are used to remove the 'Zoom' effect (if any) when the
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// custom resize/move mode is activated
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// Methods are kept on this level because moving to the presenter
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// the code that responds to the mouse events like movement
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// seems like a huge overkill
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private void SaveWindowSizeAndLocation()
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{
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this._baseZoomSize = this.Size;
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this._baseZoomLocation = this.Location;
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this._baseZoomMaximumSize = this.MaximumSize;
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}
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private void RestoreWindowSizeAndLocation()
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{
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this.Size = this._baseZoomSize;
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this.MaximumSize = this._baseZoomMaximumSize;
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this.Location = this._baseZoomLocation;
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}
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private void EnterCustomMouseMode()
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{
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this.RestoreWindowSizeAndLocation();
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this._isCustomMouseModeActive = true;
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this._baseMousePosition = Control.MousePosition;
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}
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private void ProcessCustomMouseMode(bool leftButton, bool rightButton)
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{
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Point mousePosition = Control.MousePosition;
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int offsetX = mousePosition.X - this._baseMousePosition.X;
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int offsetY = mousePosition.Y - this._baseMousePosition.Y;
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this._baseMousePosition = mousePosition;
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// Left + Right buttons trigger thumbnail resize
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// Right button only trigger thumbnail movement
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if (leftButton && rightButton)
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{
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this.Size = new Size(this.Size.Width + offsetX, this.Size.Height + offsetY);
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this._baseZoomSize = this.Size;
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}
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else
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{
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this.Location = new Point(this.Location.X + offsetX, this.Location.Y + offsetY);
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this._baseZoomLocation = this.Location;
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}
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}
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private void ExitCustomMouseMode()
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{
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this._isCustomMouseModeActive = false;
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}
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#endregion
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}
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} |