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
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   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                         if (redraw && show_grip) {
  68                                 ControlPaint.DrawSizeGrip (pe.Graphics, BackColor, ClientRectangle);
  69                         }
  70                         base.OnPaint (pe);
  71                 }
  72
  73                 protected override void OnSizeChanged (EventArgs e) {
  74                         base.OnSizeChanged (e);
  75                         redraw = true;
  76                 }
  77
  78                 protected override void OnVisibleChanged (EventArgs e) {
  79                         base.OnVisibleChanged (e);
  80                         redraw = true;
  81                 }
  82
  83                 protected override void OnMouseDown(MouseEventArgs e) {
  84                         Capture = true;
  85
  86                         capture_point = Control.MousePosition;
  87
  88                         window_w = parent.Width;
  89                         window_h = parent.Height;
  90                 }
  91
  92                 protected override void OnMouseMove(MouseEventArgs e) {
  93                         if (this.is_captured) {
  94                                 int     delta_x;
  95                                 int     delta_y;
  96                                 Point   current_point;
  97
  98                                 current_point = Control.MousePosition;
  99
 100                                 delta_x = current_point.X - capture_point.X;
 101                                 delta_y = current_point.Y - capture_point.Y;
 102
 103                                 this.parent.Size = new Size(window_w + delta_x, window_h + delta_y);
 104                                 XplatUI.DoEvents();
 105                         }
 106                 }
 107
 108                 protected override void OnMouseUp(MouseEventArgs e) {
 109                         if (Capture) {
 110                                 Capture = false;
 111                                 if (hide_pending) {
 112                                         Hide();
 113                                         hide_pending = false;
 114                                 }
 115                         }
 116                 }
 117
 118
 119                 protected override void SetVisibleCore(bool value) {
 120                         if (Capture) {
 121                                 if (value == false) {
 122                                         hide_pending = true;
 123                                 } else {
 124                                         hide_pending = false;
 125                                 }
 126                                 return;
 127                         }
 128                         base.SetVisibleCore (value);
 129                 }
 130
 131                 #endregion      // Methods
 132         }
 133 }
 134
 135