using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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namespace Bro.Common.ImageCanvas
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{
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/// <summary>
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/// This is an extension to the ZoomAndPanControol class that implements
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/// the IScrollInfo interface properties and functions.
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///
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/// IScrollInfo is implemented to allow ZoomAndPanControl to be wrapped (in XAML)
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/// in a ScrollViewer. IScrollInfo allows the ScrollViewer and ZoomAndPanControl to
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/// communicate important information such as the horizontal and vertical scrollbar offsets.
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///
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/// There is a good series of articles showing how to implement IScrollInfo starting here:
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/// http://blogs.msdn.com/bencon/archive/2006/01/05/509991.aspx
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///
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/// </summary>
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public partial class ZoomAndPanControl
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{
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/// <summary>
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/// Set to 'true' when the vertical scrollbar is enabled.
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/// </summary>
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public bool CanVerticallyScroll { get; set; } = false;
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/// <summary>
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/// Set to 'true' when the vertical scrollbar is enabled.
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/// </summary>
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public bool CanHorizontallyScroll { get; set; } = false;
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/// <summary>
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/// The width of the content (with 'ViewportZoom' applied).
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/// </summary>
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public double ExtentWidth => _unScaledExtent.Width * InternalViewportZoom;
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/// <summary>
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/// The height of the content (with 'ViewportZoom' applied).
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/// </summary>
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public double ExtentHeight => _unScaledExtent.Height * InternalViewportZoom;
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/// <summary>
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/// Get the width of the viewport onto the content.
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/// </summary>
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public double ViewportWidth => _viewport.Width;
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/// <summary>
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/// Get the height of the viewport onto the content.
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/// </summary>
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public double ViewportHeight => _viewport.Height;
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/// <summary>
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/// Reference to the ScrollViewer that is wrapped (in XAML) around the ZoomAndPanControl.
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/// Or set to null if there is no ScrollViewer.
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/// </summary>
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public ScrollViewer ScrollOwner { get; set; } = null;
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/// <summary>
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/// The offset of the horizontal scrollbar.
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/// </summary>
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public double HorizontalOffset => ContentOffsetX * InternalViewportZoom;
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/// <summary>
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/// The offset of the vertical scrollbar.
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/// </summary>
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public double VerticalOffset => ContentOffsetY * InternalViewportZoom;
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/// <summary>
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/// Called when the offset of the horizontal scrollbar has been set.
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/// </summary>
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public void SetHorizontalOffset(double offset)
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{
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if (_disableScrollOffsetSync) return;
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try
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{
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_disableScrollOffsetSync = true;
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ContentOffsetX = offset / InternalViewportZoom;
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DelayedSaveZoom750Miliseconds();
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}
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finally
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{
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_disableScrollOffsetSync = false;
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}
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}
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/// <summary>
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/// Called when the offset of the vertical scrollbar has been set.
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/// </summary>
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public void SetVerticalOffset(double offset)
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{
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if (_disableScrollOffsetSync) return;
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try
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{
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_disableScrollOffsetSync = true;
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ContentOffsetY = offset / InternalViewportZoom;
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DelayedSaveZoom750Miliseconds();
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}
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finally
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{
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_disableScrollOffsetSync = false;
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}
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}
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/// <summary>
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/// Shift the content offset one line up.
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/// </summary>
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public void LineUp()
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{
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DelayedSaveZoom750Miliseconds();
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ContentOffsetY -= (ContentViewportHeight / 10);
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}
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/// <summary>
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/// Shift the content offset one line down.
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/// </summary>
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public void LineDown()
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{
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DelayedSaveZoom750Miliseconds();
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ContentOffsetY += (ContentViewportHeight / 10);
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}
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/// <summary>
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/// Shift the content offset one line left.
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/// </summary>
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public void LineLeft()
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{
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DelayedSaveZoom750Miliseconds();
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ContentOffsetX -= (ContentViewportWidth / 10);
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}
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/// <summary>
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/// Shift the content offset one line right.
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/// </summary>
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public void LineRight()
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{
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DelayedSaveZoom750Miliseconds();
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ContentOffsetX += (ContentViewportWidth / 10);
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}
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/// <summary>
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/// Shift the content offset one page up.
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/// </summary>
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public void PageUp()
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{
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DelayedSaveZoom1500Miliseconds();
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ContentOffsetY -= ContentViewportHeight;
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}
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/// <summary>
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/// Shift the content offset one page down.
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/// </summary>
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public void PageDown()
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{
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DelayedSaveZoom1500Miliseconds();
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ContentOffsetY += ContentViewportHeight;
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}
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/// <summary>
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/// Shift the content offset one page left.
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/// </summary>
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public void PageLeft()
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{
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DelayedSaveZoom1500Miliseconds();
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ContentOffsetX -= ContentViewportWidth;
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}
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/// <summary>
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/// Shift the content offset one page right.
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/// </summary>
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public void PageRight()
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{
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DelayedSaveZoom1500Miliseconds();
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ContentOffsetX += ContentViewportWidth;
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}
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/// <summary>
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/// Don't handle mouse wheel input from the ScrollViewer, the mouse wheel is
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/// used for zooming in and out, not for manipulating the scrollbars.
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/// </summary>
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public void MouseWheelDown()
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{
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if (IsMouseWheelScrollingEnabled)
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{
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LineDown();
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}
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}
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/// <summary>
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/// Don't handle mouse wheel input from the ScrollViewer, the mouse wheel is
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/// used for zooming in and out, not for manipulating the scrollbars.
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/// </summary>
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public void MouseWheelLeft()
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{
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if (IsMouseWheelScrollingEnabled)
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{
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LineLeft();
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}
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}
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/// <summary>
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/// Don't handle mouse wheel input from the ScrollViewer, the mouse wheel is
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/// used for zooming in and out, not for manipulating the scrollbars.
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/// </summary>
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public void MouseWheelRight()
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{
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if (IsMouseWheelScrollingEnabled)
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{
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LineRight();
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}
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}
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/// <summary>
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/// Don't handle mouse wheel input from the ScrollViewer, the mouse wheel is
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/// used for zooming in and out, not for manipulating the scrollbars.
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/// </summary>
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public void MouseWheelUp()
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{
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if (IsMouseWheelScrollingEnabled)
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{
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LineUp();
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}
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}
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/// <summary>
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/// Bring the specified rectangle to view.
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/// </summary>
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public Rect MakeVisible(Visual visual, Rect rectangle)
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{
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if (_content.IsAncestorOf(visual))
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{
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var transformedRect = visual.TransformToAncestor(_content).TransformBounds(rectangle);
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var viewportRect = new Rect(ContentOffsetX, ContentOffsetY, ContentViewportWidth, ContentViewportHeight);
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if (!transformedRect.Contains(viewportRect))
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{
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double horizOffset = 0;
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double vertOffset = 0;
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if (transformedRect.Left < viewportRect.Left)
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{
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//
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// Want to move viewport left.
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//
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horizOffset = transformedRect.Left - viewportRect.Left;
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}
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else if (transformedRect.Right > viewportRect.Right)
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{
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//
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// Want to move viewport right.
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//
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horizOffset = transformedRect.Right - viewportRect.Right;
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}
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if (transformedRect.Top < viewportRect.Top)
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{
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//
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// Want to move viewport up.
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//
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vertOffset = transformedRect.Top - viewportRect.Top;
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}
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else if (transformedRect.Bottom > viewportRect.Bottom)
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{
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//
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// Want to move viewport down.
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//
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vertOffset = transformedRect.Bottom - viewportRect.Bottom;
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}
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SnapContentOffsetTo(new Point(ContentOffsetX + horizOffset, ContentOffsetY + vertOffset));
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}
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}
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return rectangle;
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}
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}
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}
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