1 files changed, 293 insertions, 0 deletions
diff --git a/source/ShiftUI/Widgets/SizeGrip.cs b/source/ShiftUI/Widgets/SizeGrip.cs
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+++ b/source/ShiftUI/Widgets/SizeGrip.cs
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+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+// Copyright (c) 2005 Novell, Inc.
+//
+// Authors:
+//	Jackson Harper ([email protected])
+
+using System;
+using System.Drawing;
+
+namespace ShiftUI {
+
+	internal class SizeGrip : Widget {
+		#region Local Variables
+		private Point	capture_point;
+		private Widget captured_Widget;
+		private int	window_w;
+		private int	window_h;
+		private bool	hide_pending;
+		private bool	captured;
+		private bool	is_virtual; // If virtual the size grip is painted directly on the captured Widgets' surface.
+		private bool	enabled;
+		private bool	fill_background;
+		private Rectangle	last_painted_area; // The last area that was painted (to know which area to invalidate when resizing).
+		#endregion	// Local Variables
+
+		#region Constructors
+		public SizeGrip (Widget CapturedWidget)
+		{
+			this.Cursor = Cursors.SizeNWSE;
+			enabled = true;
+			fill_background = true;
+			this.Size = GetDefaultSize ();
+			this.CapturedWidget = CapturedWidget;
+		}
+		#endregion	// Constructors
+
+		#region Properties
+		public bool FillBackground {
+			get {
+				return fill_background;
+			}
+			set {
+				fill_background = value;
+			}
+		}
+		
+		public bool Virtual {
+			get { 
+				return is_virtual;
+			}
+			set {
+				if (is_virtual == value)	
+					return;
+					
+				is_virtual = value;
+				if (is_virtual) {
+					CapturedWidget.MouseMove += new MouseEventHandler(HandleMouseMove);
+					CapturedWidget.MouseUp += new MouseEventHandler(HandleMouseUp);
+					CapturedWidget.MouseDown += new MouseEventHandler(HandleMouseDown);
+					CapturedWidget.EnabledChanged += new EventHandler(HandleEnabledChanged);
+					CapturedWidget.Resize += new EventHandler(HandleResize);
+				} else {
+					CapturedWidget.MouseMove -= new MouseEventHandler (HandleMouseMove);
+					CapturedWidget.MouseUp -= new MouseEventHandler (HandleMouseUp);
+					CapturedWidget.MouseDown -= new MouseEventHandler (HandleMouseDown);
+					CapturedWidget.EnabledChanged -= new EventHandler (HandleEnabledChanged);
+					CapturedWidget.Resize -= new EventHandler (HandleResize);
+				}
+			}
+		}
+		
+		public Widget CapturedWidget {
+			get {
+				return captured_Widget;
+			}
+			set {
+				captured_Widget = value;
+			}
+		}
+		
+		#endregion	// Properties
+
+		#region Methods
+		static internal Size GetDefaultSize () {
+			return new Size (SystemInformation.VerticalScrollBarWidth, SystemInformation.HorizontalScrollBarHeight);
+		}
+		
+		static internal Rectangle GetDefaultRectangle (Widget Parent)
+		{
+			Size size = GetDefaultSize ();
+			return new Rectangle (Parent.ClientSize.Width - size.Width, Parent.ClientSize.Height - size.Height, size.Width, size.Height);
+		}
+		
+		private void HandleResize (object sender, EventArgs e)
+		{
+			Widget ctrl = (Widget) sender;
+			ctrl.Invalidate (last_painted_area);
+		}
+
+		private void HandleEnabledChanged (object sender, EventArgs e)
+		{
+			Widget ctrl = (Widget) sender;
+			enabled = ctrl.Enabled;
+			Cursor cursor;
+			if (enabled) {
+				cursor = Cursors.SizeNWSE;
+			} else {
+				cursor = Cursors.Default;
+			}
+			if (is_virtual) {
+				if (CapturedWidget != null)
+					CapturedWidget.Cursor = cursor;
+			} else {
+				this.Cursor = cursor;
+			}
+			ctrl.Invalidate (GetDefaultRectangle (ctrl));
+			
+		}
+
+		// This method needs to be internal, since the captured Widget must be able to call
+		// it. We can't use events to hook it up, since then the paint ordering won't be correct
+		internal void HandlePaint (object sender, PaintEventArgs e)
+		{
+			if (Visible) {
+				Widget destination = (Widget) sender;
+				Graphics gr = e.Graphics;
+				Rectangle rect = GetDefaultRectangle (destination);
+			
+				if (!is_virtual || fill_background) {
+					gr.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (ThemeEngine.Current.ColorControl), rect);
+				}
+				if (enabled) {
+					WidgetPaint.DrawSizeGrip (gr, BackColor, rect);
+				}
+				last_painted_area = rect;
+			}
+		}
+
+		private void HandleMouseCaptureChanged (object sender, EventArgs e)
+		{
+			Widget ctrl = (Widget) sender;
+			if (captured && !ctrl.Capture) {
+				captured = false;
+				CapturedWidget.Size = new Size (window_w, window_h);
+			}
+		}
+
+		internal void HandleMouseDown (object sender, MouseEventArgs e)
+		{
+			if (enabled) {
+				Widget ctrl = (Widget)sender;
+				if (!GetDefaultRectangle (ctrl).Contains (e.X, e.Y)) {
+					return;
+				}
+				
+				ctrl.Capture = true;
+				captured = true;
+				capture_point = Widget.MousePosition;
+
+				window_w = CapturedWidget.Width;
+				window_h = CapturedWidget.Height;
+			}
+		}
+
+		internal void HandleMouseMove (object sender, MouseEventArgs e)
+		{
+			Widget ctrl = (Widget) sender;
+			Rectangle rect = GetDefaultRectangle (ctrl);
+			
+			if (rect.Contains (e.X, e.Y)) {
+				ctrl.Cursor = Cursors.SizeNWSE;
+			} else {
+				ctrl.Cursor = Cursors.Default;
+			}
+			
+			if (captured) {
+				int	delta_x;
+				int	delta_y;
+				Point	current_point;
+
+				current_point = Widget.MousePosition;
+
+				delta_x = current_point.X - capture_point.X;
+				delta_y = current_point.Y - capture_point.Y;
+
+				Widget parent = CapturedWidget;
+				Form form_parent = parent as Form;
+				Size new_size = new Size (window_w + delta_x, window_h + delta_y);
+				Size max_size = form_parent != null ? form_parent.MaximumSize : Size.Empty;
+				Size min_size = form_parent != null ? form_parent.MinimumSize : Size.Empty;
+				
+				if (new_size.Width > max_size.Width && max_size.Width > 0)
+					new_size.Width = max_size.Width;
+				else if (new_size.Width < min_size.Width)
+					new_size.Width = min_size.Width;
+				
+				if (new_size.Height > max_size.Height && max_size.Height > 0)
+					new_size.Height = max_size.Height;
+				else if (new_size.Height < min_size.Height)
+					new_size.Height = min_size.Height;
+
+				if (new_size != parent.Size) {
+					parent.Size = new_size;
+				}
+			}
+		}
+
+		internal void HandleMouseUp (object sender, MouseEventArgs e)
+		{
+			if (captured) {
+				Widget ctrl = (Widget) sender;
+				captured = false;
+				ctrl.Capture = false;
+				ctrl.Invalidate (last_painted_area);
+				
+				if (Parent is ScrollableWidget) {
+					((ScrollableWidget)Parent).UpdateSizeGripVisible ();
+				}
+				if (hide_pending) {
+					Hide();
+					hide_pending = false;
+				}
+			}
+		}
+
+
+		protected override void SetVisibleCore(bool value) {
+			if (Capture) {
+				if (value == false) {
+					hide_pending = true;
+				} else {
+					hide_pending = false;
+				}
+				return;
+			}
+			base.SetVisibleCore (value);
+		}
+
+		protected override void OnPaint (PaintEventArgs pe)
+		{
+			HandlePaint (this, pe);
+			base.OnPaint (pe);
+		}
+
+		protected override void OnMouseCaptureChanged (EventArgs e)
+		{
+			base.OnMouseCaptureChanged (e);
+			HandleMouseCaptureChanged (this, e);
+		}
+
+		protected override void OnEnabledChanged (EventArgs e)
+		{
+			base.OnEnabledChanged (e);
+			HandleEnabledChanged (this, e);
+		}
+		
+		protected override void OnMouseDown (MouseEventArgs e)
+		{
+			HandleMouseDown (this, e);
+		}
+		
+		protected override void OnMouseMove(MouseEventArgs e)
+		{
+			HandleMouseMove (this, e);
+		}
+
+		protected override void OnMouseUp (MouseEventArgs e)
+		{
+			HandleMouseUp (this, e);
+		}
+		#endregion	// Methods
+	}
+}
+
+