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//
// FlowLayoutPanel.cs
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2006 Jonathan Pobst
//
// Authors:
// Jonathan Pobst ([email protected])
//
using ShiftUI.Layout;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Drawing;
using System;
namespace ShiftUI
{
[ComVisibleAttribute (true)]
[ClassInterfaceAttribute (ClassInterfaceType.AutoDispatch)]
[ProvideProperty ("FlowBreak", typeof (Widget))]
[DefaultProperty ("FlowDirection")]
[Docking (DockingBehavior.Ask)]
//[Designer ("ShiftUI.Design.FlowLayoutPanelDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
[ToolboxWidget]
public class FlowLayoutPanel : Panel, IExtenderProvider
{
private FlowLayoutSettings settings;
public FlowLayoutPanel () : base ()
{
CreateDockPadding ();
}
#region Properties
[Localizable (true)]
[DefaultValue (FlowDirection.LeftToRight)]
public FlowDirection FlowDirection {
get { return LayoutSettings.FlowDirection; }
set { LayoutSettings.FlowDirection = value; }
}
[LocalizableAttribute (true)]
[DefaultValue (true)]
public bool WrapContents {
get { return LayoutSettings.WrapContents; }
set { LayoutSettings.WrapContents = value; }
}
public override LayoutEngine LayoutEngine {
get { return this.LayoutSettings.LayoutEngine; }
}
internal FlowLayoutSettings LayoutSettings {
get {
if (this.settings == null)
this.settings = new FlowLayoutSettings (this);
return this.settings;
}
}
#endregion
#region Public Methods
[DefaultValue (false)]
[DisplayName ("FlowBreak")]
public bool GetFlowBreak (Widget control)
{
return LayoutSettings.GetFlowBreak (control);
}
[DisplayName ("FlowBreak")]
public void SetFlowBreak (Widget control, bool value)
{
LayoutSettings.SetFlowBreak (control, value);
}
#endregion
#region IExtenderProvider Members
bool IExtenderProvider.CanExtend (object obj)
{
if (obj is Widget)
if ((obj as Widget).Parent == this)
return true;
return false;
}
#endregion
#region Internal Methods
internal override void CalculateCanvasSize (bool canOverride)
{
if (canOverride)
canvas_size = ClientSize;
else
base.CalculateCanvasSize (canOverride);
}
protected override void OnLayout (LayoutEventArgs levent)
{
base.OnLayout (levent);
// base.OnLayout() calls CalculateCanvasSize(true) in which we just set the canvas to
// clientsize so we could re-layout everything according to the flow.
// This time we want to actually calculate the canvas.
CalculateCanvasSize (false);
if (AutoSize && (canvas_size.Width > ClientSize.Width || canvas_size.Height > ClientSize.Height)) {
ClientSize = canvas_size;
}
AdjustFormScrollbars (AutoScroll);
}
internal override Size GetPreferredSizeCore (Size proposedSize)
{
int width = 0;
int height = 0;
bool horizontal = FlowDirection == FlowDirection.LeftToRight || FlowDirection == FlowDirection.RightToLeft;
if (!WrapContents || (horizontal && proposedSize.Width == 0) || (!horizontal && proposedSize.Height == 0)) {
foreach (Widget control in Widgets) {
Size control_preferred_size;
if (control.AutoSize)
control_preferred_size = control.PreferredSize;
else
control_preferred_size = control.Size;
Padding control_margin = control.Margin;
if (horizontal) {
width += control_preferred_size.Width + control_margin.Horizontal;
height = Math.Max (height, control_preferred_size.Height + control_margin.Vertical);
} else {
height += control_preferred_size.Height + control_margin.Vertical;
width = Math.Max (width, control_preferred_size.Width + control_margin.Horizontal);
}
}
} else {
int size_in_flow_direction = 0;
int size_in_other_direction = 0;
int increase;
foreach (Widget control in Widgets) {
Size control_preferred_size;
if (control.AutoSize)
control_preferred_size = control.PreferredSize;
else
control_preferred_size = control.ExplicitBounds.Size;
Padding control_margin = control.Margin;
if (horizontal) {
increase = control_preferred_size.Width + control_margin.Horizontal;
if (size_in_flow_direction != 0 && size_in_flow_direction + increase >= proposedSize.Width) {
width = Math.Max (width, size_in_flow_direction);
size_in_flow_direction = 0;
height += size_in_other_direction;
size_in_other_direction = 0;
}
size_in_flow_direction += increase;
size_in_other_direction = Math.Max (size_in_other_direction, control_preferred_size.Height + control_margin.Vertical);
} else {
increase = control_preferred_size.Height + control_margin.Vertical;
if (size_in_flow_direction != 0 && size_in_flow_direction + increase >= proposedSize.Height) {
height = Math.Max (height, size_in_flow_direction);
size_in_flow_direction = 0;
width += size_in_other_direction;
size_in_other_direction = 0;
}
size_in_flow_direction += increase;
size_in_other_direction = Math.Max (size_in_other_direction, control_preferred_size.Width + control_margin.Horizontal);
}
}
if (horizontal) {
width = Math.Max (width, size_in_flow_direction);
height += size_in_other_direction;
} else {
height = Math.Max (height, size_in_flow_direction);
width += size_in_other_direction;
}
}
return new Size (width, height);
}
#endregion
}
}
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