Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / DockPanel.cs / 1 / DockPanel.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: DockPanel.cs // // Description: Contains the DockPanel class. // Spec at [....]/layout/Specs/DockPanel.xml // // History: // 06/11/2003 : [....] - Added to WCP branch (was Stack.cs in old branch) // //--------------------------------------------------------------------------- using MS.Internal; using MS.Internal.PresentationFramework; using MS.Utility; using System.Diagnostics; using System.Windows.Threading; using System.Windows.Media; using System; namespace System.Windows.Controls { #region Dock enum type ////// Dock - Enum which describes how to position and stretch the child of a DockPanel. /// ///public enum Dock { /// /// Position this child at the left of the remaining space. /// Left, ////// Position this child at the top of the remaining space. /// Top, ////// Position this child at the right of the remaining space. /// Right, ////// Position this child at the bottom of the remaining space. /// Bottom, } #endregion ////// DockPanel is used to size and position children inward from the edges of available space. /// /// A public class DockPanel : Panel { //------------------------------------------------------------------- // // Constructors // //------------------------------------------------------------------- #region Constructors ///enum (see and ) /// determines on which size a child is placed. Children are stacked in order from these edges until /// there is no more space; this happens when previous children have consumed all available space, or a child /// with Dock set to Fill is encountered. /// /// Default DependencyObject constructor /// ////// Automatic determination of current Dispatcher. Use alternative constructor /// that accepts a Dispatcher for best performance. /// public DockPanel() : base() { } #endregion //-------------------------------------------------------------------- // // Public Methods // //------------------------------------------------------------------- #region Public Methods ////// Reads the attached property Dock from the given element. /// /// UIElement from which to read the attached property. ///The property's value. ///[AttachedPropertyBrowsableForChildren()] public static Dock GetDock(UIElement element) { if (element == null) { throw new ArgumentNullException("element"); } return (Dock) element.GetValue(DockProperty); } /// /// Writes the attached property Dock to the given element. /// /// UIElement to which to write the attached property. /// The property value to set ///public static void SetDock(UIElement element, Dock dock) { if (element == null) { throw new ArgumentNullException("element"); } element.SetValue(DockProperty, dock); } private static void OnDockChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { UIElement uie = d as UIElement; //it may be anyting, like FlowDocument... bug 1237275 if(uie != null) { DockPanel p = VisualTreeHelper.GetParent(uie) as DockPanel; if(p != null) { p.InvalidateMeasure(); } } } #endregion //-------------------------------------------------------------------- // // Public Properties + Dependency Properties's // //-------------------------------------------------------------------- #region Public Properties /// /// This property controls whether the last child in the DockPanel should be stretched to fill any /// remaining available space. /// public bool LastChildFill { get { return (bool) GetValue(LastChildFillProperty); } set { SetValue(LastChildFillProperty, value); } } ////// DependencyProperty for [CommonDependencyProperty] public static readonly DependencyProperty LastChildFillProperty = DependencyProperty.Register( "LastChildFill", typeof(bool), typeof(DockPanel), new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.AffectsArrange)); ///property. /// /// DependencyProperty for Dock property. /// ////// [CommonDependencyProperty] public static readonly DependencyProperty DockProperty = DependencyProperty.RegisterAttached( "Dock", typeof(Dock), typeof(DockPanel), new FrameworkPropertyMetadata( Dock.Left, new PropertyChangedCallback(OnDockChanged)), new ValidateValueCallback(IsValidDock)); #endregion //------------------------------------------------------------------- // // Protected Methods // //-------------------------------------------------------------------- #region Protected Methods /// /// Updates DesiredSize of the DockPanel. Called by parent UIElement. This is the first pass of layout. /// ////// Children are measured based on their sizing properties and /// Constraint size is an "upper limit" that the return value should not exceed. ///. /// Each child is allowed to consume all of the space on the side on which it is docked; Left/Right docked /// children are granted all vertical space for their entire width, and Top/Bottom docked children are /// granted all horizontal space for their entire height. /// The Panel's desired size. protected override Size MeasureOverride(Size constraint) { UIElementCollection children = InternalChildren; double parentWidth = 0; // Our current required width due to children thus far. double parentHeight = 0; // Our current required height due to children thus far. double accumulatedWidth = 0; // Total width consumed by children. double accumulatedHeight = 0; // Total height consumed by children. for (int i = 0, count = children.Count; i < count; ++i) { UIElement child = children[i]; Size childConstraint; // Contains the suggested input constraint for this child. Size childDesiredSize; // Contains the return size from child measure. if (child == null) { continue; } // Child constraint is the remaining size; this is total size minus size consumed by previous children. childConstraint = new Size(Math.Max(0.0, constraint.Width - accumulatedWidth), Math.Max(0.0, constraint.Height - accumulatedHeight)); // Measure child. child.Measure(childConstraint); childDesiredSize = child.DesiredSize; // Now, we adjust: // 1. Size consumed by children (accumulatedSize). This will be used when computing subsequent // children to determine how much space is remaining for them. // 2. Parent size implied by this child (parentSize) when added to the current children (accumulatedSize). // This is different from the size above in one respect: A Dock.Left child implies a height, but does // not actually consume any height for subsequent children. // If we accumulate size in a given dimension, the next child (or the end conditions after the child loop) // will deal with computing our minimum size (parentSize) due to that accumulation. // Therefore, we only need to compute our minimum size (parentSize) in dimensions that this child does // not accumulate: Width for Top/Bottom, Height for Left/Right. switch (DockPanel.GetDock(child)) { case Dock.Left: case Dock.Right: parentHeight = Math.Max(parentHeight, accumulatedHeight + childDesiredSize.Height); accumulatedWidth += childDesiredSize.Width; break; case Dock.Top: case Dock.Bottom: parentWidth = Math.Max(parentWidth, accumulatedWidth + childDesiredSize.Width); accumulatedHeight += childDesiredSize.Height; break; } } // Make sure the final accumulated size is reflected in parentSize. parentWidth = Math.Max(parentWidth, accumulatedWidth); parentHeight = Math.Max(parentHeight, accumulatedHeight); return (new Size(parentWidth, parentHeight)); } ////// DockPanel computes a position and final size for each of its children based upon their /// /// Size that DockPanel will assume to position children. protected override Size ArrangeOverride(Size arrangeSize) { UIElementCollection children = InternalChildren; int totalChildrenCount = children.Count; int nonFillChildrenCount = totalChildrenCount - (LastChildFill ? 1 : 0); double accumulatedLeft = 0; double accumulatedTop = 0; double accumulatedRight = 0; double accumulatedBottom = 0; for (int i = 0; i < totalChildrenCount; ++i) { UIElement child = children[i]; if (child == null) { continue; } Size childDesiredSize = child.DesiredSize; Rect rcChild = new Rect( accumulatedLeft, accumulatedTop, Math.Max(0.0, arrangeSize.Width - (accumulatedLeft + accumulatedRight)), Math.Max(0.0, arrangeSize.Height - (accumulatedTop + accumulatedBottom)) ); if (i < nonFillChildrenCount) { switch (DockPanel.GetDock(child)) { case Dock.Left: accumulatedLeft += childDesiredSize.Width; rcChild.Width = childDesiredSize.Width; break; case Dock.Right: accumulatedRight += childDesiredSize.Width; rcChild.X = Math.Max(0.0, arrangeSize.Width - accumulatedRight); rcChild.Width = childDesiredSize.Width; break; case Dock.Top: accumulatedTop += childDesiredSize.Height; rcChild.Height = childDesiredSize.Height; break; case Dock.Bottom: accumulatedBottom += childDesiredSize.Height; rcChild.Y = Math.Max(0.0, arrangeSize.Height - accumulatedBottom); rcChild.Height = childDesiredSize.Height; break; } } child.Arrange(rcChild); } return (arrangeSize); } #endregion Protected Methods //------------------------------------------------------------------- // // Private Methods // //------------------------------------------------------------------- #region Private Methods internal static bool IsValidDock(object o) { Dock dock = (Dock)o; return ( dock == Dock.Left || dock == Dock.Top || dock == Dock.Right || dock == Dock.Bottom); } // // This property // 1. Finds the correct initial size for the _effectiveValues store on the current DependencyObject // 2. This is a performance optimization // internal override int EffectiveValuesInitialSize { get { return 9; } } #endregion Private Methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.enum and sizing properties. ///
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