mcs/class/Managed.Windows.Forms/System.Windows.Forms.Layout/DefaultLayout.cs

   1 //
   2 // DefaultLayout.cs
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 // Copyright (c) 2006 Jonathan Pobst
  24 //
  25 // Authors:
  26 //      Jonathan Pobst (monkey@jpobst.com)
  27 //
  28
  29 using System;
  30 using System.Drawing;
  31
  32 namespace System.Windows.Forms.Layout
  33 {
  34         class DefaultLayout : LayoutEngine
  35         {
  36                 void LayoutDockedChildren (Control parent, Control[] controls)
  37                 {
  38                         Rectangle space = parent.DisplayRectangle;
  39
  40                         // Deal with docking; go through in reverse, MS docs say that lowest Z-order is closest to edge
  41                         for (int i = controls.Length - 1; i >= 0; i--) {
  42                                 Control child = controls[i];
  43
  44                                 if (!child.VisibleInternal
  45                                     || child.ControlLayoutType == Control.LayoutType.Anchor)
  46                                         continue;
  47
  48                                 switch (child.Dock) {
  49                                 case DockStyle.None:
  50                                         // Do nothing
  51                                         break;
  52
  53                                 case DockStyle.Left:
  54                                         child.SetImplicitBounds (space.Left, space.Y, child.Width, space.Height);
  55                                         space.X += child.Width;
  56                                         space.Width -= child.Width;
  57                                         break;
  58
  59                                 case DockStyle.Top:
  60                                         child.SetImplicitBounds (space.Left, space.Y, space.Width, child.Height);
  61                                         space.Y += child.Height;
  62                                         space.Height -= child.Height;
  63                                         break;
  64
  65                                 case DockStyle.Right:
  66                                         child.SetImplicitBounds (space.Right - child.Width, space.Y, child.Width, space.Height);
  67                                         space.Width -= child.Width;
  68                                         break;
  69
  70                                 case DockStyle.Bottom:
  71                                         child.SetImplicitBounds (space.Left, space.Bottom - child.Height, space.Width, child.Height);
  72                                         space.Height -= child.Height;
  73                                         break;
  74                                 }
  75                         }
  76
  77                         for (int i = controls.Length - 1; i >= 0; i--) {
  78                                 Control child = controls[i];
  79
  80                                 if (child.VisibleInternal
  81                                     && (child.ControlLayoutType == Control.LayoutType.Dock)
  82                                     && (child.Dock == DockStyle.Fill))
  83                                         child.SetBounds (space.Left, space.Top, space.Width, space.Height);
  84                         }
  85                 }
  86
  87                 void LayoutAnchoredChildren (Control parent, Control[] controls)
  88                 {
  89                         Rectangle space = parent.DisplayRectangle;
  90
  91                         for (int i = 0; i < controls.Length; i++) {
  92                                 int left;
  93                                 int top;
  94                                 int width;
  95                                 int height;
  96
  97                                 Control child = controls[i];
  98
  99                                 if (!child.VisibleInternal
 100                                     || child.ControlLayoutType == Control.LayoutType.Dock)
 101                                         continue;
 102
 103                                 AnchorStyles anchor = child.Anchor;
 104
 105                                 left = child.Left;
 106                                 top = child.Top;
 107                                 width = child.Width;
 108                                 height = child.Height;
 109
 110                                 if ((anchor & AnchorStyles.Right) != 0) {
 111                                         if ((anchor & AnchorStyles.Left) != 0)
 112                                                 width = space.Width - child.dist_right - left;
 113                                         else
 114                                                 left = space.Width - child.dist_right - width;
 115                                 }
 116                                 else if ((anchor & AnchorStyles.Left) == 0) {
 117                                         // left+=diff_width/2 will introduce rounding errors (diff_width removed from svn after r51780)
 118                                         // This calculates from scratch every time:
 119                                         left = left + (space.Width - (left + width + child.dist_right)) / 2;
 120                                 }
 121
 122                                 if ((anchor & AnchorStyles.Bottom) != 0) {
 123                                         if ((anchor & AnchorStyles.Top) != 0)
 124                                                 height = space.Height - child.dist_bottom - top;
 125                                         else
 126                                                 top = space.Height - child.dist_bottom - height;
 127                                 }
 128                                 else if ((anchor & AnchorStyles.Top) == 0) {
 129                                         // top += diff_height/2 will introduce rounding errors (diff_height removed from after r51780)
 130                                         // This calculates from scratch every time:
 131                                         top = top + (space.Height - (top + height + child.dist_bottom)) / 2;
 132                                 }
 133
 134                                 // Sanity
 135                                 if (width < 0)
 136                                         width = 0;
 137
 138                                 if (height < 0)
 139                                         height = 0;
 140
 141                                 child.SetBounds (left, top, width, height);
 142                         }
 143                 }
 144
 145                 public override bool Layout (object container, LayoutEventArgs args)
 146                 {
 147                         Control parent = container as Control;
 148
 149                         Control[] controls = parent.Controls.GetAllControls ();
 150
 151                         LayoutDockedChildren (parent, controls);
 152                         LayoutAnchoredChildren (parent, controls);
 153
 154                         return false;
 155                 }
 156         }
 157 }