mcs/class/Managed.Windows.Forms/System.Windows.Forms/SizeGrip.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2005 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Jackson Harper (jackson@ximian.com)
  24
  25 // TODO: Eventually we need to handle the cursor and resizing the parent
  26
  27 using System;
  28 using System.Drawing;
  29
  30 namespace System.Windows.Forms {
  31
  32         internal class SizeGrip : Control {
  33                 #region Local Variables
  34                 private bool    redraw;
  35                 private Point   capture_point;
  36                 private int     window_w;
  37                 private int     window_h;
  38                 private bool    show_grip;
  39                 private bool    hide_pending;
  40                 #endregion      // Local Variables
  41
  42                 #region Constructors
  43                 public SizeGrip ()
  44                 {
  45                         this.Cursor = Cursors.SizeNWSE;
  46                         show_grip = true;
  47                         redraw = true;
  48                         hide_pending = false;
  49                 }
  50                 #endregion      // Constructors
  51
  52                 #region Properties
  53                 public bool ShowGrip {
  54                         get {
  55                                 return show_grip;
  56                         }
  57
  58                         set {
  59                                 show_grip = value;
  60                                 redraw = true;
  61                         }
  62                 }
  63                 #endregion      // Properties
  64
  65                 #region Methods
  66                 protected override void OnPaint (PaintEventArgs pe) {
  67                         base.OnPaint (pe);
  68
  69                         if (redraw) {
  70                                 if (show_grip) {
  71                                         ControlPaint.DrawSizeGrip(DeviceContext, BackColor, ClientRectangle);
  72                                 }
  73                         }
  74
  75                         pe.Graphics.DrawImage(ImageBuffer, pe.ClipRectangle, pe.ClipRectangle, GraphicsUnit.Pixel);
  76                 }
  77
  78                 protected override void OnSizeChanged (EventArgs e) {
  79                         base.OnSizeChanged (e);
  80                         redraw = true;
  81                 }
  82
  83                 protected override void OnVisibleChanged (EventArgs e) {
  84                         base.OnVisibleChanged (e);
  85                         redraw = true;
  86                 }
  87
  88                 protected override void OnMouseDown(MouseEventArgs e) {\r
  89                         Capture = true;\r
  90                         \r
  91                         capture_point = Control.MousePosition;\r
  92 \r
  93                         window_w = parent.Width;\r
  94                         window_h = parent.Height;\r
  95                 }\r
  96 \r
  97                 protected override void OnMouseMove(MouseEventArgs e) {\r
  98                         if (this.is_captured) {\r
  99                                 int     delta_x;\r
 100                                 int     delta_y;\r
 101                                 Point   current_point;\r
 102 \r
 103                                 current_point = Control.MousePosition;\r
 104 \r
 105                                 delta_x = current_point.X - capture_point.X;\r
 106                                 delta_y = current_point.Y - capture_point.Y;\r
 107 \r
 108                                 this.parent.Size = new Size(window_w + delta_x, window_h + delta_y);\r
 109                                 XplatUI.DoEvents();\r
 110                         }\r
 111                 }\r
 112
 113                 protected override void OnMouseUp(MouseEventArgs e) {\r
 114                         if (Capture) {\r
 115                                 Capture = false;\r
 116                                 if (hide_pending) {\r
 117                                         Hide();\r
 118                                         hide_pending = false;\r
 119                                 }\r
 120                         }\r
 121                 }\r
 122 \r
 123 \r
 124                 protected override void SetVisibleCore(bool value) {\r
 125                         if (Capture) {\r
 126                                 if (value == false) {\r
 127                                         hide_pending = true;\r
 128                                 } else {\r
 129                                         hide_pending = false;\r
 130                                 }\r
 131                                 return;\r
 132                         }\r
 133                         base.SetVisibleCore (value);\r
 134                 }\r
 135 \r
 136                 #endregion      // Methods\r
 137         }
 138 }
 139
 140