288 lines
11 KiB
C#
288 lines
11 KiB
C#
//
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// DefaultLayout.cs
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (c) 2006 Jonathan Pobst
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//
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// Authors:
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// Jonathan Pobst (monkey@jpobst.com)
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// Stefan Noack (noackstefan@googlemail.com)
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//
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using System;
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using System.Drawing;
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using System.Collections;
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namespace System.Windows.Forms.Layout
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{
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class DefaultLayout : LayoutEngine
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{
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internal static readonly DefaultLayout Instance = new DefaultLayout();
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private DefaultLayout ()
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{
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}
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public override void InitLayout (object child, BoundsSpecified specified)
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{
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IArrangedElement control = (IArrangedElement)child;
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IArrangedElement parent = control.Parent;
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if (parent != null) {
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Rectangle bounds = control.Bounds;
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if ((specified & (BoundsSpecified.Width | BoundsSpecified.X)) != BoundsSpecified.None)
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control.DistanceRight = parent.DisplayRectangle.Right - bounds.X - bounds.Width;
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if ((specified & (BoundsSpecified.Height | BoundsSpecified.Y)) != BoundsSpecified.None)
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control.DistanceBottom = parent.DisplayRectangle.Bottom - bounds.Y - bounds.Height;
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}
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}
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static void LayoutDockedChildren (IArrangedElement parent, IList controls)
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{
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Rectangle space = parent.DisplayRectangle;
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IArrangedElement mdi = null;
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// Deal with docking; go through in reverse, MS docs say that lowest Z-order is closest to edge
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for (int i = controls.Count - 1; i >= 0; i--) {
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IArrangedElement child = (IArrangedElement)controls[i];
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Size child_size = child.Bounds.Size;
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if (!child.Visible || child.Dock == DockStyle.None)
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continue;
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// MdiClient never fills the whole area like other controls, have to do it later
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if (child is MdiClient) {
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mdi = child;
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continue;
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}
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switch (child.Dock) {
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case DockStyle.None:
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// Do nothing
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break;
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case DockStyle.Left:
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if (child.AutoSize)
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child_size = child.GetPreferredSize(new Size(0, space.Height));
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child.SetBounds (space.Left, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
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space.X += child_size.Width;
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space.Width -= child_size.Width;
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break;
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case DockStyle.Top:
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if (child.AutoSize)
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child_size = child.GetPreferredSize(new Size(space.Width, 0));
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child.SetBounds (space.Left, space.Y, space.Width, child_size.Height, BoundsSpecified.None);
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space.Y += child_size.Height;
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space.Height -= child_size.Height;
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break;
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case DockStyle.Right:
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if (child.AutoSize)
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child_size = child.GetPreferredSize(new Size(0, space.Height));
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child.SetBounds (space.Right - child_size.Width, space.Y, child_size.Width, space.Height, BoundsSpecified.None);
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space.Width -= child_size.Width;
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break;
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case DockStyle.Bottom:
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if (child.AutoSize)
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child_size = child.GetPreferredSize(new Size(space.Width, 0));
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child.SetBounds (space.Left, space.Bottom - child_size.Height, space.Width, child_size.Height, BoundsSpecified.None);
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space.Height -= child_size.Height;
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break;
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case DockStyle.Fill:
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child.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
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break;
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}
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}
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// MdiClient gets whatever space is left
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if (mdi != null)
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mdi.SetBounds (space.Left, space.Top, space.Width, space.Height, BoundsSpecified.None);
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}
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static void LayoutAnchoredChildren (IArrangedElement parent, IList controls)
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{
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Rectangle space = parent.DisplayRectangle;
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foreach (IArrangedElement child in controls) {
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if (!child.Visible || child.Dock != DockStyle.None)
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continue;
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AnchorStyles anchor = child.Anchor;
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Rectangle bounds = child.Bounds;
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int left = bounds.Left;
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int top = bounds.Top;
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int width = bounds.Width;
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int height = bounds.Height;
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if ((anchor & AnchorStyles.Right) != 0) {
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if ((anchor & AnchorStyles.Left) != 0)
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width = space.Right - child.DistanceRight - left;
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else
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left = space.Right - child.DistanceRight - width;
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}
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else if ((anchor & AnchorStyles.Left) == 0) {
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// left+=diff_width/2 will introduce rounding errors (diff_width removed from svn after r51780)
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// This calculates from scratch every time:
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left += (space.Width - (left + width + child.DistanceRight)) / 2;
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child.DistanceRight = space.Width - (left + width);
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}
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if ((anchor & AnchorStyles.Bottom) != 0) {
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if ((anchor & AnchorStyles.Top) != 0)
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height = space.Bottom - child.DistanceBottom - top;
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else
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top = space.Bottom - child.DistanceBottom - height;
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}
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else if ((anchor & AnchorStyles.Top) == 0) {
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// top += diff_height/2 will introduce rounding errors (diff_height removed from after r51780)
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// This calculates from scratch every time:
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top += (space.Height - (top + height + child.DistanceBottom)) / 2;
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child.DistanceBottom = space.Height - (top + height);
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}
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// Sanity
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if (width < 0)
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width = 0;
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if (height < 0)
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height = 0;
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if (child.AutoSize) {
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Size proposed_size = Size.Empty;
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if ((anchor & (AnchorStyles.Left | AnchorStyles.Right)) == (AnchorStyles.Left | AnchorStyles.Right))
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proposed_size.Width = width;
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if ((anchor & (AnchorStyles.Top | AnchorStyles.Bottom)) == (AnchorStyles.Top | AnchorStyles.Bottom))
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proposed_size.Height = height;
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Size preferred_size = GetPreferredControlSize (child, proposed_size);
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if ((anchor & (AnchorStyles.Left | AnchorStyles.Right)) != AnchorStyles.Right)
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child.DistanceRight += width - preferred_size.Width;
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else
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left += width - preferred_size.Width;
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if ((anchor & (AnchorStyles.Top | AnchorStyles.Bottom)) != AnchorStyles.Bottom)
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child.DistanceBottom += height - preferred_size.Height;
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else
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top += height - preferred_size.Height;
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child.SetBounds (left, top, preferred_size.Width, preferred_size.Height, BoundsSpecified.None);
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} else {
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child.SetBounds (left, top, width, height, BoundsSpecified.None);
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}
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}
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}
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public override bool Layout (object container, LayoutEventArgs args)
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{
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IArrangedContainer parent = (IArrangedContainer)container;
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if (parent.Controls is Control.ControlCollection controlCollection) {
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LayoutDockedChildren (parent, controlCollection.GetAllControls());
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LayoutAnchoredChildren (parent, controlCollection.GetAllControls());
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} else {
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LayoutDockedChildren (parent, parent.Controls);
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LayoutAnchoredChildren (parent, parent.Controls);
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}
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return parent.AutoSize;
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}
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static private Size GetPreferredControlSize (IArrangedElement child, Size proposed)
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{
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var preferredsize = child.GetPreferredSize (proposed);
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int width, height;
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if (child.GetAutoSizeMode () == AutoSizeMode.GrowAndShrink)
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{
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width = preferredsize.Width;
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height = preferredsize.Height;
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}
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else
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{
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width = child.ExplicitBounds.Width;
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height = child.ExplicitBounds.Height;
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if (preferredsize.Width > width)
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width = preferredsize.Width;
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if (preferredsize.Height > height)
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height = preferredsize.Height;
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}
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return new Size(width, height);
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}
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internal override Size GetPreferredSize (object container, Size proposedConstraints)
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{
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IArrangedContainer parent = (IArrangedContainer)container;
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IList controls = parent.Controls;
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Size retsize = Size.Empty;
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// Add up the requested sizes for Docked controls
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for (int i = controls.Count - 1; i >= 0; i--) {
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IArrangedElement child = (IArrangedElement)controls[i];
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if (!child.Visible || child.Dock == DockStyle.None)
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continue;
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if (child.Dock == DockStyle.Left || child.Dock == DockStyle.Right) {
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Size sz = child.AutoSize ? child.GetPreferredSize (new Size(0, proposedConstraints.Height)) : child.Bounds.Size;
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retsize.Width += sz.Width;
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} else if (child.Dock == DockStyle.Top || child.Dock == DockStyle.Bottom) {
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Size sz = child.AutoSize ? child.GetPreferredSize (new Size(proposedConstraints.Width, 0)) : child.Bounds.Size;
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retsize.Height += sz.Height;
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} else if (child.Dock == DockStyle.Fill && child.AutoSize) {
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Size sz = child.GetPreferredSize (proposedConstraints);
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retsize += sz;
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}
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}
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// See if any non-Docked control is positioned lower or more right than our size
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foreach (IArrangedElement child in parent.Controls) {
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if (!child.Visible || child.Dock != DockStyle.None)
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continue;
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// If its anchored to the bottom or right, that doesn't really count
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if ((child.Anchor & (AnchorStyles.Bottom | AnchorStyles.Top)) == AnchorStyles.Bottom ||
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(child.Anchor & (AnchorStyles.Right | AnchorStyles.Left)) == AnchorStyles.Right)
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continue;
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Rectangle child_bounds = child.Bounds;
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if (child.AutoSize) {
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Size proposed_child_size = Size.Empty;
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if ((child.Anchor & (AnchorStyles.Left | AnchorStyles.Right)) == (AnchorStyles.Left | AnchorStyles.Right)) {
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proposed_child_size.Width = proposedConstraints.Width - child.DistanceRight - (child_bounds.Left - parent.DisplayRectangle.Left);
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}
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if ((child.Anchor & (AnchorStyles.Top | AnchorStyles.Bottom)) == (AnchorStyles.Top | AnchorStyles.Bottom)) {
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proposed_child_size.Height = proposedConstraints.Height - child.DistanceBottom - (child_bounds.Top - parent.DisplayRectangle.Top);
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}
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Size preferred_size = GetPreferredControlSize (child, proposed_child_size);
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child_bounds = new Rectangle (child_bounds.Location, preferred_size);
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}
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// This is the non-sense Microsoft uses (Padding vs DisplayRectangle)
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retsize.Width = Math.Max (retsize.Width, child_bounds.Right - parent.Padding.Left + child.Margin.Right);
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retsize.Height = Math.Max (retsize.Height, child_bounds.Bottom - parent.Padding.Top + child.Margin.Bottom);
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//retsize.Width = Math.Max (retsize.Width, child_bounds.Right - parent.DisplayRectangle.Left + child.Margin.Right);
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//retsize.Height = Math.Max (retsize.Height, child_bounds.Bottom - parent.DisplayRectangle.Top + child.Margin.Bottom);
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}
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return retsize;
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}
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}
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}
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