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 Control captured_control;
  35                 private int     window_w;
  36                 private int     window_h;
  37                 private bool    show_grip;
  38                 private bool    hide_pending;
  39                 #endregion      // Local Variables
  40
  41                 #region Constructors
  42                 public SizeGrip ()
  43                 {
  44                         this.Cursor = Cursors.SizeNWSE;
  45                         show_grip = true;
  46                         redraw = true;
  47                         hide_pending = false;
  48                 }
  49                 #endregion      // Constructors
  50
  51                 #region Properties
  52
  53                 public Control CapturedControl {
  54                         get {
  55                                 if (captured_control != null)
  56                                         return captured_control;
  57                                 else
  58                                         return Parent;
  59                         }
  60                         set {
  61                                 captured_control = value;
  62                         }
  63                 }
  64
  65                 public bool ShowGrip {
  66                         get {
  67                                 return show_grip;
  68                         }
  69
  70                         set {
  71                                 show_grip = value;
  72                                 redraw = true;
  73                         }
  74                 }
  75                 #endregion      // Properties
  76
  77                 #region Methods
  78                 protected override void OnPaint (PaintEventArgs pe) {
  79                         if (redraw && show_grip) {
  80                                 pe.Graphics.FillRectangle (new SolidBrush (ThemeEngine.Current.ColorControl), ClientRectangle);
  81                                 ControlPaint.DrawSizeGrip (pe.Graphics, BackColor, ClientRectangle);
  82                         }
  83                         base.OnPaint (pe);
  84                 }
  85
  86                 protected override void OnSizeChanged (EventArgs e) {
  87                         base.OnSizeChanged (e);
  88                         redraw = true;
  89                 }
  90
  91                 protected override void OnVisibleChanged (EventArgs e) {
  92                         base.OnVisibleChanged (e);
  93                         redraw = true;
  94                 }
  95
  96                 protected override void OnMouseDown(MouseEventArgs e) {
  97                         Capture = true;
  98
  99                         capture_point = Control.MousePosition;
 100
 101                         window_w = CapturedControl.Width;
 102                         window_h = CapturedControl.Height;
 103                 }
 104
 105                 protected override void OnMouseMove(MouseEventArgs e) {
 106                         if (Capture) {
 107                                 int     delta_x;
 108                                 int     delta_y;
 109                                 Point   current_point;
 110
 111                                 current_point = Control.MousePosition;
 112
 113                                 delta_x = current_point.X - capture_point.X;
 114                                 delta_y = current_point.Y - capture_point.Y;
 115
 116                                 CapturedControl.Size = new Size(window_w + delta_x, window_h + delta_y);
 117                                 XplatUI.DoEvents();
 118                         }
 119                 }
 120
 121                 protected override void OnMouseUp(MouseEventArgs e) {
 122                         if (Capture) {
 123                                 Capture = false;
 124                                 if (hide_pending) {
 125                                         Hide();
 126                                         hide_pending = false;
 127                                 }
 128                         }
 129                 }
 130
 131
 132                 protected override void SetVisibleCore(bool value) {
 133                         if (Capture) {
 134                                 if (value == false) {
 135                                         hide_pending = true;
 136                                 } else {
 137                                         hide_pending = false;
 138                                 }
 139                                 return;
 140                         }
 141                         base.SetVisibleCore (value);
 142                 }
 143
 144                 #endregion      // Methods
 145         }
 146 }
 147
 148