// Select shapes inside the selection frame
private bool PerformFrameSelection(IDiagramPresenter diagramPresenter, MouseState mouseState)
{
bool multiSelect = mouseState.IsKeyPressed(KeysDg.Control) || mouseState.IsKeyPressed(KeysDg.Shift);
diagramPresenter.SelectShapes(frameRect, multiSelect);
return true;
}
private bool IsEditCaptionFeasible(IDiagramPresenter diagramPresenter, MouseState mouseState, ShapeAtCursorInfo shapeAtCursorInfo) {
if (shapeAtCursorInfo.IsEmpty || mouseState.IsEmpty)
return false;
if (!diagramPresenter.Project.SecurityManager.IsGranted(Permission.ModifyData, shapeAtCursorInfo.Shape))
return false;
if (!shapeAtCursorInfo.IsCursorAtCaption)
return false;
if (mouseState.IsKeyPressed(KeysDg.Control) || mouseState.IsKeyPressed(KeysDg.Shift))
return false;
return true;
}
// (Un)Select shape unter the mouse pointer
private bool PerformSelection(IDiagramPresenter diagramPresenter, MouseState mouseState,
ShapeAtCursorInfo shapeAtCursorInfo)
{
bool result = false;
bool multiSelect = mouseState.IsKeyPressed(KeysDg.Control) || mouseState.IsKeyPressed(KeysDg.Shift);
// When selecting shapes conteolpoints should be ignored as the user does not see them
// until a shape is selected
const ControlPointCapabilities capabilities = ControlPointCapabilities.None;
const int range = 0;
// Determine the shape that has to be selected:
Shape shapeToSelect = null;
if (!selectedShapeAtCursorInfo.IsEmpty) {
// When in multiSelection mode, unselect the selected shape under the cursor
if (multiSelect) shapeToSelect = selectedShapeAtCursorInfo.Shape;
else {
// First, check if the selected shape under the cursor has children that can be selected
shapeToSelect = selectedShapeAtCursorInfo.Shape.Children.FindShape(mouseState.X, mouseState.Y, capabilities, range,
null);
// Second, check if the selected shape under the cursor has siblings that can be selected
if (shapeToSelect == null && selectedShapeAtCursorInfo.Shape.Parent != null) {
shapeToSelect = selectedShapeAtCursorInfo.Shape.Parent.Children.FindShape(mouseState.X, mouseState.Y, capabilities,
range, selectedShapeAtCursorInfo.Shape);
// Discard found shape if it is the selected shape at cursor
if (shapeToSelect == selectedShapeAtCursorInfo.Shape) shapeToSelect = null;
if (shapeToSelect == null) {
foreach (
Shape shape in
selectedShapeAtCursorInfo.Shape.Parent.Children.FindShapes(mouseState.X, mouseState.Y, capabilities, range)) {
if (shape == selectedShapeAtCursorInfo.Shape) continue;
// Ignore layer visibility for child shapes
shapeToSelect = shape;
break;
}
}
}
}
}
// If there was a shape to select related to the selected shape under the cursor
// (a child or a sibling of the selected shape or a shape below it),
// try to select the first non-selected shape under the cursor
if (shapeToSelect == null && shapeAtCursorInfo.Shape != null
&& shapeAtCursorInfo.Shape.ContainsPoint(mouseState.X, mouseState.Y))
shapeToSelect = shapeAtCursorInfo.Shape;
// If a new shape to select was found, perform selection
if (shapeToSelect != null) {
// (check if multiselection mode is enabled (Shift + Click or Ctrl + Click))
if (multiSelect) {
// if multiSelect is enabled, add/remove to/from selected selectedShapes...
if (diagramPresenter.SelectedShapes.Contains(shapeToSelect)) {
// if object is selected -> remove from selection
diagramPresenter.UnselectShape(shapeToSelect);
RemovePreviewOf(shapeToSelect);
result = true;
}
else {
// If object is not selected -> add to selection
diagramPresenter.SelectShape(shapeToSelect, true);
result = true;
}
}
else {
// ... otherwise deselect all selectedShapes but the clicked object
ClearPreviews();
// check if the clicked shape is a child of an already selected shape
Shape childShape = null;
if (diagramPresenter.SelectedShapes.Count == 1
&& diagramPresenter.SelectedShapes.TopMost.Children != null
&& diagramPresenter.SelectedShapes.TopMost.Children.Count > 0) {
childShape = diagramPresenter.SelectedShapes.TopMost.Children.FindShape(mouseState.X, mouseState.Y,
ControlPointCapabilities.None, 0, null);
}
diagramPresenter.SelectShape(childShape ?? shapeToSelect, false);
result = true;
}
// validate if the desired shape or its parent was selected
if (shapeToSelect.Parent != null) {
if (!diagramPresenter.SelectedShapes.Contains(shapeToSelect))
if (diagramPresenter.SelectedShapes.Contains(shapeToSelect.Parent))
shapeToSelect = shapeToSelect.Parent;
}
}
else if (selectedShapeAtCursorInfo.IsEmpty) {
// if there was no other shape to select and none of the selected shapes is under the cursor,
// clear selection
if (!multiSelect) {
if (diagramPresenter.SelectedShapes.Count > 0) {
diagramPresenter.UnselectAll();
ClearPreviews();
result = true;
}
}
}
return result;
}
private int AlignAngle(int angle, MouseState mouseState) {
int result = angle;
if (mouseState.IsKeyPressed(KeysDg.Control) && mouseState.IsKeyPressed(KeysDg.Shift)) {
// rotate by tenths of degrees
// do nothing
} else if (mouseState.IsKeyPressed(KeysDg.Control)) {
// rotate by full degrees
result -= (result % 10);
} else if (mouseState.IsKeyPressed(KeysDg.Shift)) {
// rotate by 5 degrees
result -= (result % 50);
} else {
// default:
// rotate by 15 degrees
result -= (result % 150);
}
return result;
}