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 //      Stefan Noack (noackstefan@googlemail.com)
  28 //
  29
  30 using System;
  31 using System.Drawing;
  32
  33 namespace System.Windows.Forms.Layout
  34 {
  35         class DefaultLayout : LayoutEngine
  36         {
  37                 void LayoutDockedChildren (Control parent, Control[] controls)
  38                 {
  39                         Rectangle space = parent.DisplayRectangle;
  40                         MdiClient mdi = null;
  41
  42                         // Deal with docking; go through in reverse, MS docs say that lowest Z-order is closest to edge
  43                         for (int i = controls.Length - 1; i >= 0; i--) {
  44                                 Control child = controls[i];
  45                                 Size child_size = child.Size;
  46
  47 #if NET_2_0
  48                                 if (child.AutoSize)
  49                                         child_size = GetPreferredControlSize (child);
  50 #endif
  51
  52                                 if (!child.VisibleInternal
  53                                     || child.ControlLayoutType == Control.LayoutType.Anchor)
  54                                         continue;
  55
  56                                 // MdiClient never fills the whole area like other controls, have to do it later
  57                                 if (child is MdiClient) {
  58                                         mdi = (MdiClient)child;
  59                                         continue;
  60                                 }
  61
  62                                 switch (child.Dock) {
  63                                 case DockStyle.None:
  64                                         // Do nothing
  65                                         break;
  66
  67                                 case DockStyle.Left:
  68                                         child.SetBounds (space.Left, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
  69                                         space.X += child.Width;
  70                                         space.Width -= child.Width;
  71                                         break;
  72
  73                                 case DockStyle.Top:
  74                                         child.SetBounds (space.Left, space.Y, space.Width, child_size.Height, BoundsSpecified.None);
  75                                         space.Y += child.Height;
  76                                         space.Height -= child.Height;
  77                                         break;
  78
  79                                 case DockStyle.Right:
  80                                         child.SetBounds (space.Right - child_size.Width, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
  81                                         space.Width -= child.Width;
  82                                         break;
  83
  84                                 case DockStyle.Bottom:
  85                                         child.SetBounds (space.Left, space.Bottom - child_size.Height, space.Width, child_size.Height, BoundsSpecified.None);
  86                                         space.Height -= child.Height;
  87                                         break;
  88
  89                                 case DockStyle.Fill:
  90                                         child.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
  91                                         break;
  92                                 }
  93                         }
  94
  95                         // MdiClient gets whatever space is left
  96                         if (mdi != null)
  97                                 mdi.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
  98                 }
  99
 100                 void LayoutAnchoredChildren (Control parent, Control[] controls)
 101                 {
 102                         Rectangle space = parent.ClientRectangle;
 103
 104                         for (int i = 0; i < controls.Length; i++) {
 105                                 int left;
 106                                 int top;
 107                                 int width;
 108                                 int height;
 109
 110                                 Control child = controls[i];
 111
 112                                 if (!child.VisibleInternal
 113                                     || child.ControlLayoutType == Control.LayoutType.Dock)
 114                                         continue;
 115
 116                                 AnchorStyles anchor = child.Anchor;
 117
 118                                 left = child.Left;
 119                                 top = child.Top;
 120
 121                                 width = child.Width;
 122                                 height = child.Height;
 123
 124                                 if ((anchor & AnchorStyles.Right) != 0) {
 125                                         if ((anchor & AnchorStyles.Left) != 0)
 126                                                 width = space.Width - child.dist_right - left;
 127                                         else
 128                                                 left = space.Width - child.dist_right - width;
 129                                 }
 130                                 else if ((anchor & AnchorStyles.Left) == 0) {
 131                                         // left+=diff_width/2 will introduce rounding errors (diff_width removed from svn after r51780)
 132                                         // This calculates from scratch every time:
 133                                         left = left + (space.Width - (left + width + child.dist_right)) / 2;
 134                                         child.dist_right = space.Width - (left + width);
 135                                 }
 136
 137                                 if ((anchor & AnchorStyles.Bottom) != 0) {
 138                                         if ((anchor & AnchorStyles.Top) != 0)
 139                                                 height = space.Height - child.dist_bottom - top;
 140                                         else
 141                                                 top = space.Height - child.dist_bottom - height;
 142                                 }
 143                                 else if ((anchor & AnchorStyles.Top) == 0) {
 144                                         // top += diff_height/2 will introduce rounding errors (diff_height removed from after r51780)
 145                                         // This calculates from scratch every time:
 146                                         top = top + (space.Height - (top + height + child.dist_bottom)) / 2;
 147                                         child.dist_bottom = space.Height - (top + height);
 148                                 }
 149
 150                                 // Sanity
 151                                 if (width < 0)
 152                                         width = 0;
 153
 154                                 if (height < 0)
 155                                         height = 0;
 156
 157                                 child.SetBounds (left, top, width, height, BoundsSpecified.None);
 158                         }
 159                 }
 160
 161 #if NET_2_0
 162                 void LayoutAutoSizedChildren (Control parent, Control[] controls)
 163                 {
 164                         for (int i = 0; i < controls.Length; i++) {
 165                                 int left;
 166                                 int top;
 167
 168                                 Control child = controls[i];
 169                                 if (!child.VisibleInternal
 170                                     || child.ControlLayoutType == Control.LayoutType.Dock
 171                                     || !child.AutoSize)
 172                                         continue;
 173
 174                                 left = child.Left;
 175                                 top = child.Top;
 176
 177                                 Size preferredsize = GetPreferredControlSize (child);
 178
 179                                 child.SetBounds (left, top, preferredsize.Width, preferredsize.Height, BoundsSpecified.None);
 180                         }
 181                 }
 182
 183                 void LayoutAutoSizeContainer (Control container)
 184                 {
 185                         int left;
 186                         int top;
 187                         int width;
 188                         int height;
 189
 190                         if (!container.VisibleInternal || container.ControlLayoutType == Control.LayoutType.Dock || !container.AutoSize)
 191                                 return;
 192
 193                         left = container.Left;
 194                         top = container.Top;
 195
 196                         Size preferredsize = container.PreferredSize;
 197
 198                         if (container.GetAutoSizeMode () == AutoSizeMode.GrowAndShrink) {
 199                                 width = preferredsize.Width;
 200                                 height = preferredsize.Height;
 201                         } else {
 202                                 width = container.ExplicitBounds.Width;
 203                                 height = container.ExplicitBounds.Height;
 204                                 if (preferredsize.Width > width)
 205                                         width = preferredsize.Width;
 206                                 if (preferredsize.Height > height)
 207                                         height = preferredsize.Height;
 208                         }
 209
 210                         // Sanity
 211                         if (width < container.MinimumSize.Width)
 212                                 width = container.MinimumSize.Width;
 213
 214                         if (height < container.MinimumSize.Height)
 215                                 height = container.MinimumSize.Height;
 216
 217                         if (container.MaximumSize.Width != 0 && width > container.MaximumSize.Width)
 218                                 width = container.MaximumSize.Width;
 219
 220                         if (container.MaximumSize.Height != 0 && height > container.MaximumSize.Height)
 221                                 height = container.MaximumSize.Height;
 222
 223                         container.SetBounds (left, top, width, height, BoundsSpecified.None);
 224                 }
 225 #endif
 226
 227                 public override bool Layout (object container, LayoutEventArgs args)
 228                 {
 229                         Control parent = container as Control;
 230
 231                         Control[] controls = parent.Controls.GetAllControls ();
 232
 233                         LayoutDockedChildren (parent, controls);
 234                         LayoutAnchoredChildren (parent, controls);
 235 #if NET_2_0
 236                         LayoutAutoSizedChildren (parent, controls);
 237                         if (parent is Form) LayoutAutoSizeContainer (parent);
 238 #endif
 239
 240                         return false;
 241                 }
 242
 243 #if NET_2_0
 244                 private Size GetPreferredControlSize (Control child)
 245                 {
 246                         int width;
 247                         int height;
 248                         Size preferredsize = child.PreferredSize;
 249
 250                         if (child.GetAutoSizeMode () == AutoSizeMode.GrowAndShrink) {
 251                                 width = preferredsize.Width;
 252                                 height = preferredsize.Height;
 253                         } else {
 254                                 width = child.ExplicitBounds.Width;
 255                                 height = child.ExplicitBounds.Height;
 256                                 if (preferredsize.Width > width)
 257                                         width = preferredsize.Width;
 258                                 if (preferredsize.Height > height)
 259                                         height = preferredsize.Height;
 260                         }
 261
 262                         // Sanity
 263                         if (width < child.MinimumSize.Width)
 264                                 width = child.MinimumSize.Width;
 265
 266                         if (height < child.MinimumSize.Height)
 267                                 height = child.MinimumSize.Height;
 268
 269                         if (child.MaximumSize.Width != 0 && width > child.MaximumSize.Width)
 270                                 width = child.MaximumSize.Width;
 271
 272                         if (child.MaximumSize.Height != 0 && height > child.MaximumSize.Height)
 273                                 height = child.MaximumSize.Height;
 274
 275                         return new Size (width, height);
 276                 }
 277 #endif
 278         }
 279 }