/// <summary>
/// Apply new line width
/// </summary>
public static bool ApplyLineWidth(DrawingCanvas drawingCanvas, double value, bool addToHistory)
{
CommandChangeState command = new CommandChangeState(drawingCanvas);
bool wasChange = false;
// LineWidth is set for all objects except of GraphicsText.
// Though GraphicsText has this property, it should remain constant.
foreach (GraphicsBase g in drawingCanvas.Selection)
{
if (g is GraphicsRectangle ||
g is GraphicsLine ||
g is GraphicsPolyLine)
{
if (g.LineWidth != value)
{
g.LineWidth = value;
wasChange = true;
}
}
}
if (wasChange && addToHistory)
{
command.NewState(drawingCanvas);
drawingCanvas.AddCommandToHistory(command);
}
return(wasChange);
}
/// <summary>
/// Move selection to back
/// </summary>
public static void MoveSelectionToBack(DrawingCanvas drawingCanvas)
{
// Moving to back of z-order means moving
// to the beginning of VisualCollection.
// Read GraphicsList in the reverse order, and move every selected object
// to temporary list.
List <GraphicsBase> list = new List <GraphicsBase>();
CommandChangeOrder command = new CommandChangeOrder(drawingCanvas);
for (int i = drawingCanvas.Count - 1; i >= 0; i--)
{
if (drawingCanvas[i].IsSelected)
{
list.Add(drawingCanvas[i]);
drawingCanvas.GraphicsList.RemoveAt(i);
}
}
// Add all items from temporary list to the beginning of GraphicsList
foreach (GraphicsBase g in list)
{
drawingCanvas.GraphicsList.Insert(0, g);
}
if (list.Count > 0)
{
command.NewState(drawingCanvas);
drawingCanvas.AddCommandToHistory(command);
}
}
/// <summary>
/// Delete all graphic objects
/// </summary>
public static void DeleteAll(DrawingCanvas drawingCanvas)
{
if (drawingCanvas.GraphicsList.Count > 0)
{
drawingCanvas.AddCommandToHistory(new CommandDeleteAll(drawingCanvas));
drawingCanvas.GraphicsList.Clear();
}
}
/// <summary>
/// Add change to history.
/// Called after finishing moving/resizing.
/// </summary>
public void AddChangeToHistory(DrawingCanvas drawingCanvas)
{
if (commandChangeState != null && wasMove)
{
// Keep state after moving/resizing and add command to history
commandChangeState.NewState(drawingCanvas);
drawingCanvas.AddCommandToHistory(commandChangeState);
commandChangeState = null;
}
}
/// <summary>
/// Return true if currently active properties (line width, color etc.)
/// can be applied to selected items.
///
/// If at least one selected object has property different from currently
/// active property value, properties can be applied.
/// </summary>
//public static bool CanApplyProperties(DrawingCanvas drawingCanvas)
//{
// foreach(GraphicsBase graphicsBase in drawingCanvas.GraphicsList)
// {
// if ( ! graphicsBase.IsSelected )
// {
// continue;
// }
// // ObjectColor - used in all graphics objects
// if ( graphicsBase.ObjectColor != drawingCanvas.ObjectColor )
// {
// return true;
// }
// return false;
//}
/// <summary>
/// Apply currently active properties to selected objects
/// </summary>
public static void ApplyProperties(DrawingCanvas drawingCanvas)
{
// Apply every property.
// Call every Apply* function with addToHistory = false.
// History is updated here and not in called functions.
CommandChangeState command = new CommandChangeState(drawingCanvas);
bool wasChange = false;
if (wasChange)
{
command.NewState(drawingCanvas);
drawingCanvas.AddCommandToHistory(command);
}
}
/// <summary>
/// Delete selected graphic objects
/// </summary>
public static void DeleteSelection(DrawingCanvas drawingCanvas)
{
CommandDelete command = new CommandDelete(drawingCanvas);
bool wasChange = false;
for (int i = drawingCanvas.Count - 1; i >= 0; i--)
{
if (drawingCanvas[i].IsSelected)
{
drawingCanvas.GraphicsList.RemoveAt(i);
wasChange = true;
}
}
if (wasChange)
{
drawingCanvas.AddCommandToHistory(command);
}
}
/// <summary>
/// Apply new color
/// </summary>
public static bool ApplyColor(DrawingCanvas drawingCanvas, Color value, bool addToHistory)
{
CommandChangeState command = new CommandChangeState(drawingCanvas);
bool wasChange = false;
foreach (GraphicsBase g in drawingCanvas.Selection)
{
if (g.ObjectColor != value)
{
g.ObjectColor = value;
wasChange = true;
}
}
if (wasChange && addToHistory)
{
command.NewState(drawingCanvas);
drawingCanvas.AddCommandToHistory(command);
}
return(wasChange);
}
/// <summary>
/// Left mouse is released.
/// New object is created and resized.
/// </summary>
public override void OnMouseUp(DrawingCanvas drawingCanvas, Point position)
{
if (drawingCanvas.Count > 0)
{
GraphicsBase o = drawingCanvas[drawingCanvas.Count - 1] as GraphicsBase;
o.MoveMouse(position);
if (!o.HasDelta())
{
drawingCanvas.GraphicsList.Remove(o);
}
}
if (drawingCanvas.Count > 0)
{
drawingCanvas[drawingCanvas.Count - 1].Normalize();
drawingCanvas.AddCommandToHistory(new CommandAdd(drawingCanvas[drawingCanvas.Count - 1]));
}
drawingCanvas.Cursor = Cursors.Arrow;
drawingCanvas.ReleaseMouseCapture();
drawingCanvas.InvalidateMeasure();
}
