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 using System;
  26 using System.Drawing;
  27
  28 namespace System.Windows.Forms {
  29
  30         internal class SizeGrip : Control {
  31                 #region Local Variables
  32                 private bool    redraw;
  33                 private Point   capture_point;
  34                 private int     window_w;
  35                 private int     window_h;
  36                 private bool    show_grip;
  37                 private bool    hide_pending;
  38                 #endregion      // Local Variables
  39
  40                 #region Constructors
  41                 public SizeGrip ()
  42                 {
  43                         this.Cursor = Cursors.SizeNWSE;
  44                         show_grip = true;
  45                         redraw = true;
  46                         hide_pending = false;
  47                 }
  48                 #endregion      // Constructors
  49
  50                 #region Properties
  51                 public bool ShowGrip {
  52                         get {
  53                                 return show_grip;
  54                         }
  55
  56                         set {
  57                                 show_grip = value;
  58                                 redraw = true;
  59                         }
  60                 }
  61                 #endregion      // Properties
  62
  63                 #region Methods
  64                 protected override void OnPaint (PaintEventArgs pe) {
  65                         if (redraw && show_grip) {
  66                                 ControlPaint.DrawSizeGrip (pe.Graphics, BackColor, ClientRectangle);
  67                         }
  68                         base.OnPaint (pe);
  69                 }
  70
  71                 protected override void OnSizeChanged (EventArgs e) {
  72                         base.OnSizeChanged (e);
  73                         redraw = true;
  74                 }
  75
  76                 protected override void OnVisibleChanged (EventArgs e) {
  77                         base.OnVisibleChanged (e);
  78                         redraw = true;
  79                 }
  80
  81                 protected override void OnMouseDown(MouseEventArgs e) {
  82                         Capture = true;
  83
  84                         capture_point = Control.MousePosition;
  85
  86                         window_w = parent.Width;
  87                         window_h = parent.Height;
  88                 }
  89
  90                 protected override void OnMouseMove(MouseEventArgs e) {
  91                         if (this.is_captured) {
  92                                 int     delta_x;
  93                                 int     delta_y;
  94                                 Point   current_point;
  95
  96                                 current_point = Control.MousePosition;
  97
  98                                 delta_x = current_point.X - capture_point.X;
  99                                 delta_y = current_point.Y - capture_point.Y;
 100
 101                                 this.parent.Size = new Size(window_w + delta_x, window_h + delta_y);
 102                                 XplatUI.DoEvents();
 103                         }
 104                 }
 105
 106                 protected override void OnMouseUp(MouseEventArgs e) {
 107                         if (Capture) {
 108                                 Capture = false;
 109                                 if (hide_pending) {
 110                                         Hide();
 111                                         hide_pending = false;
 112                                 }
 113                         }
 114                 }
 115
 116
 117                 protected override void SetVisibleCore(bool value) {
 118                         if (Capture) {
 119                                 if (value == false) {
 120                                         hide_pending = true;
 121                                 } else {
 122                                         hide_pending = false;
 123                                 }
 124                                 return;
 125                         }
 126                         base.SetVisibleCore (value);
 127                 }
 128
 129                 #endregion      // Methods
 130         }
 131 }
 132
 133