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Imported Upstream version 4.2.0.179
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Jo Shields
Jo Shields
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//
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// FlowLayoutPanel.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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//
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using System.Windows.Forms.Layout;
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using System.ComponentModel;
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using System.Runtime.InteropServices;
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using System.Drawing;
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namespace System.Windows.Forms
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{
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[ComVisibleAttribute (true)]
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[ClassInterfaceAttribute (ClassInterfaceType.AutoDispatch)]
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[ProvideProperty ("FlowBreak", typeof (Control))]
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[DefaultProperty ("FlowDirection")]
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[Docking (DockingBehavior.Ask)]
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[Designer ("System.Windows.Forms.Design.FlowLayoutPanelDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
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public class FlowLayoutPanel : Panel, IExtenderProvider
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{
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private FlowLayoutSettings settings;
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public FlowLayoutPanel () : base ()
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{
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CreateDockPadding ();
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}
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#region Properties
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[Localizable (true)]
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[DefaultValue (FlowDirection.LeftToRight)]
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public FlowDirection FlowDirection {
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get { return LayoutSettings.FlowDirection; }
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set { LayoutSettings.FlowDirection = value; }
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}
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[LocalizableAttribute (true)]
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[DefaultValue (true)]
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public bool WrapContents {
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get { return LayoutSettings.WrapContents; }
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set { LayoutSettings.WrapContents = value; }
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}
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public override LayoutEngine LayoutEngine {
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get { return this.LayoutSettings.LayoutEngine; }
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}
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internal FlowLayoutSettings LayoutSettings {
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get {
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if (this.settings == null)
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this.settings = new FlowLayoutSettings (this);
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return this.settings;
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}
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}
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#endregion
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#region Public Methods
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[DefaultValue (false)]
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[DisplayName ("FlowBreak")]
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public bool GetFlowBreak (Control control)
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{
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return LayoutSettings.GetFlowBreak (control);
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}
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[DisplayName ("FlowBreak")]
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public void SetFlowBreak (Control control, bool value)
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{
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LayoutSettings.SetFlowBreak (control, value);
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}
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#endregion
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#region IExtenderProvider Members
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bool IExtenderProvider.CanExtend (object obj)
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{
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if (obj is Control)
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if ((obj as Control).Parent == this)
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return true;
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return false;
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}
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#endregion
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#region Internal Methods
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internal override void CalculateCanvasSize (bool canOverride)
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{
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if (canOverride)
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canvas_size = ClientSize;
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else
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base.CalculateCanvasSize (canOverride);
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}
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protected override void OnLayout (LayoutEventArgs levent)
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{
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base.OnLayout (levent);
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// base.OnLayout() calls CalculateCanvasSize(true) in which we just set the canvas to
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// clientsize so we could re-layout everything according to the flow.
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// This time we want to actually calculate the canvas.
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CalculateCanvasSize (false);
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if (AutoSize && (canvas_size.Width > ClientSize.Width || canvas_size.Height > ClientSize.Height)) {
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ClientSize = canvas_size;
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}
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AdjustFormScrollbars (AutoScroll);
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}
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internal override Size GetPreferredSizeCore (Size proposedSize)
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{
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int width = 0;
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int height = 0;
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bool horizontal = FlowDirection == FlowDirection.LeftToRight || FlowDirection == FlowDirection.RightToLeft;
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if (!WrapContents || (horizontal && proposedSize.Width == 0) || (!horizontal && proposedSize.Height == 0)) {
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foreach (Control control in Controls) {
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Size control_preferred_size;
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if (control.AutoSize)
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control_preferred_size = control.PreferredSize;
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else
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control_preferred_size = control.Size;
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Padding control_margin = control.Margin;
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if (horizontal) {
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width += control_preferred_size.Width + control_margin.Horizontal;
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height = Math.Max (height, control_preferred_size.Height + control_margin.Vertical);
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} else {
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height += control_preferred_size.Height + control_margin.Vertical;
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width = Math.Max (width, control_preferred_size.Width + control_margin.Horizontal);
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}
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}
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} else {
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int size_in_flow_direction = 0;
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int size_in_other_direction = 0;
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int increase;
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foreach (Control control in Controls) {
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Size control_preferred_size;
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if (control.AutoSize)
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control_preferred_size = control.PreferredSize;
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else
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control_preferred_size = control.ExplicitBounds.Size;
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Padding control_margin = control.Margin;
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if (horizontal) {
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increase = control_preferred_size.Width + control_margin.Horizontal;
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if (size_in_flow_direction != 0 && size_in_flow_direction + increase >= proposedSize.Width) {
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width = Math.Max (width, size_in_flow_direction);
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size_in_flow_direction = 0;
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height += size_in_other_direction;
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size_in_other_direction = 0;
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}
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size_in_flow_direction += increase;
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size_in_other_direction = Math.Max (size_in_other_direction, control_preferred_size.Height + control_margin.Vertical);
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} else {
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increase = control_preferred_size.Height + control_margin.Vertical;
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if (size_in_flow_direction != 0 && size_in_flow_direction + increase >= proposedSize.Height) {
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height = Math.Max (height, size_in_flow_direction);
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size_in_flow_direction = 0;
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width += size_in_other_direction;
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size_in_other_direction = 0;
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}
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size_in_flow_direction += increase;
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size_in_other_direction = Math.Max (size_in_other_direction, control_preferred_size.Width + control_margin.Horizontal);
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}
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}
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if (horizontal) {
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width = Math.Max (width, size_in_flow_direction);
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height += size_in_other_direction;
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} else {
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height = Math.Max (height, size_in_flow_direction);
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width += size_in_other_direction;
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}
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}
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return new Size (width, height);
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}
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#endregion
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}
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}
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