Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / documents / ScrollData.cs / 1305600 / ScrollData.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: ScrollData.cs // // Description: IScrollInfo implementation helper for FlowDocumentView, TextBoxView. // //--------------------------------------------------------------------------- namespace MS.Internal.Documents { using System; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using MS.Internal; // IScrollInfo implementation helper for FlowDocumentView, TextBoxView. internal class ScrollData { //------------------------------------------------------------------- // // Internal Methods // //------------------------------------------------------------------- #region Internal Methods ////// internal void LineUp(UIElement owner) { SetVerticalOffset(owner, _offset.Y - ScrollViewer._scrollLineDelta); } ////// /// internal void LineDown(UIElement owner) { SetVerticalOffset(owner, _offset.Y + ScrollViewer._scrollLineDelta); } ////// /// internal void LineLeft(UIElement owner) { SetHorizontalOffset(owner, _offset.X - ScrollViewer._scrollLineDelta); } ////// /// internal void LineRight(UIElement owner) { SetHorizontalOffset(owner, _offset.X + ScrollViewer._scrollLineDelta); } ////// /// internal void PageUp(UIElement owner) { SetVerticalOffset(owner, _offset.Y - _viewport.Height); } ////// /// internal void PageDown(UIElement owner) { SetVerticalOffset(owner, _offset.Y + _viewport.Height); } ////// /// internal void PageLeft(UIElement owner) { SetHorizontalOffset(owner, _offset.X - _viewport.Width); } ////// /// internal void PageRight(UIElement owner) { SetHorizontalOffset(owner, _offset.X + _viewport.Width); } ////// /// internal void MouseWheelUp(UIElement owner) { SetVerticalOffset(owner, _offset.Y - ScrollViewer._mouseWheelDelta); } ////// /// internal void MouseWheelDown(UIElement owner) { SetVerticalOffset(owner, _offset.Y + ScrollViewer._mouseWheelDelta); } ////// /// internal void MouseWheelLeft(UIElement owner) { SetHorizontalOffset(owner, _offset.X - ScrollViewer._mouseWheelDelta); } ////// /// internal void MouseWheelRight(UIElement owner) { SetHorizontalOffset(owner, _offset.X + ScrollViewer._mouseWheelDelta); } ////// /// internal void SetHorizontalOffset(UIElement owner, double offset) { if (!this.CanHorizontallyScroll) { return; } offset = Math.Max(0, Math.Min(_extent.Width - _viewport.Width, offset)); if (!DoubleUtil.AreClose(offset, _offset.X)) { _offset.X = offset; owner.InvalidateArrange(); if (_scrollOwner != null) { _scrollOwner.InvalidateScrollInfo(); } } } ////// /// internal void SetVerticalOffset(UIElement owner, double offset) { if (!this.CanVerticallyScroll) { return; } offset = Math.Max(0, Math.Min(_extent.Height - _viewport.Height, offset)); if (!DoubleUtil.AreClose(offset, _offset.Y)) { _offset.Y = offset; owner.InvalidateArrange(); if (_scrollOwner != null) { _scrollOwner.InvalidateScrollInfo(); } } } ////// /// internal Rect MakeVisible(UIElement owner, Visual visual, Rect rectangle) { // We can only work on visuals that are us or children. // An empty rect has no size or position. We can't meaningfully use it. if (rectangle.IsEmpty || visual == null || (visual != owner && !owner.IsAncestorOf(visual))) { return Rect.Empty; } // Compute the child's rect relative to (0,0) in our coordinate space. GeneralTransform childTransform = visual.TransformToAncestor(owner); rectangle = childTransform.TransformBounds(rectangle); // Initialize the viewport Rect viewport = new Rect(_offset.X, _offset.Y, _viewport.Width, _viewport.Height); rectangle.X += viewport.X; rectangle.Y += viewport.Y; // Compute the offsets required to minimally scroll the child maximally into view. double minX = ComputeScrollOffset(viewport.Left, viewport.Right, rectangle.Left, rectangle.Right); double minY = ComputeScrollOffset(viewport.Top, viewport.Bottom, rectangle.Top, rectangle.Bottom); // We have computed the scrolling offsets; scroll to them. SetHorizontalOffset(owner, minX); SetVerticalOffset(owner, minY); // Compute the visible rectangle of the child relative to the viewport. if (this.CanHorizontallyScroll) { viewport.X = minX; } else { // munge the intersection rectangle.X = viewport.X; } if (this.CanVerticallyScroll) { viewport.Y = minY; } else { // munge the intersection rectangle.Y = viewport.Y; } rectangle.Intersect(viewport); if (!rectangle.IsEmpty) { rectangle.X -= viewport.X; rectangle.Y -= viewport.Y; } // Return the rectangle return rectangle; } ////// /// internal void SetScrollOwner(UIElement owner, ScrollViewer value) { if (value != _scrollOwner) { // Reset cached scroll info. _disableHorizonalScroll = false; _disableVerticalScroll = false; _offset = new Vector(); _viewport = new Size(); _extent = new Size(); _scrollOwner = value; owner.InvalidateArrange(); } } #endregion Internal Methods //-------------------------------------------------------------------- // // Internal Properties // //------------------------------------------------------------------- #region Internal Properties ////// /// internal bool CanVerticallyScroll { get { return !_disableVerticalScroll; } set { _disableVerticalScroll = !value; } } ////// /// internal bool CanHorizontallyScroll { get { return !_disableHorizonalScroll; } set { _disableHorizonalScroll = !value; } } ////// /// internal double ExtentWidth { get { return _extent.Width; } set { _extent.Width = value; } } ////// /// internal double ExtentHeight { get { return _extent.Height; } set { _extent.Height = value; } } ////// /// internal double ViewportWidth { get { return _viewport.Width; } } ////// /// internal double ViewportHeight { get { return _viewport.Height; } } ////// /// internal double HorizontalOffset { get { return _offset.X; } } ////// /// internal double VerticalOffset { get { return _offset.Y; } } ////// /// internal ScrollViewer ScrollOwner { get { return _scrollOwner; } } // HorizontalOffset/VerticalOffset as a Vector. internal Vector Offset { get { return _offset; } set { _offset = value; } } // ExtenttWidth/ExtentHeight as a Size. internal Size Extent { get { return _extent; } set { _extent = value; } } // ViewportWidth/ViewportHeight as a Size. internal Size Viewport { get { return _viewport; } set { _viewport = value; } } #endregion Internal Properties //-------------------------------------------------------------------- // // Private Methods // //-------------------------------------------------------------------- #region Private Methods ////// /// Compute scroll offset for child rectangle. /// private double ComputeScrollOffset(double topView, double bottomView, double topChild, double bottomChild) { // # CHILD POSITION REMEDY // 1 Above viewport Align top edge of child & viewport // 2 Below viewport Align top edge of child & viewport // 3 Entirely within viewport No scroll // 4 Spanning viewport Align top edge of child & viewport // // Note: "Above viewport" = childTop above viewportTop, childBottom above viewportBottom // "Below viewport" = childTop below viewportTop, childBottom below viewportBottom // These child thus may overlap with the viewport, but will scroll the same direction/ bool topInView = DoubleUtil.GreaterThanOrClose(topChild, topView) && DoubleUtil.LessThan(topChild, bottomView); bool bottomInView = DoubleUtil.LessThanOrClose(bottomChild, bottomView) && DoubleUtil.GreaterThan(bottomChild, topView); double position; if (topInView && bottomInView) { position = topView; } else { position = topChild; } return position; } #endregion Private Methods //------------------------------------------------------------------- // // Private Fields // //-------------------------------------------------------------------- #region Private Fields private bool _disableHorizonalScroll; private bool _disableVerticalScroll; private Vector _offset; private Size _viewport; private Size _extent; private ScrollViewer _scrollOwner; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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