Implemented selection using rectangles in symbol editor

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@535 0fc631ac-6414-0410-93d0-97cfa31319b6

src/gui/symbol/selection.hpp

@@ -0,0 +1,81 @@
+//+----------------------------------------------------------------------------+
+//| Description:  Magic Set Editor - Program to make Magic (tm) cards          |
+//| Copyright:    (C) 2001 - 2007 Twan van Laarhoven                           |
+//| License:      GNU General Public License 2 or later (see file COPYING)     |
+//+----------------------------------------------------------------------------+
+
+#ifndef HEADER_GUI_SYMBOL_SELECTION
+#define HEADER_GUI_SYMBOL_SELECTION
+
+// ----------------------------------------------------------------------------- : Includes
+
+#include <util/prec.hpp>
+
+class Vector2D;
+DECLARE_POINTER_TYPE(Symbol);
+DECLARE_POINTER_TYPE(SymbolPart);
+DECLARE_POINTER_TYPE(SymbolShape);
+class SymbolGroup;
+
+// ----------------------------------------------------------------------------- : Selection
+
+enum SelectMode
+{	SELECT_OVERRIDE		// give a completely new selection
+,	SELECT_IF_OUTSIDE	// define a new selection if the affected part is not already selected
+,	SELECT_TOGGLE		// toggle selection of affected part
+};
+
+/// The selected parts of a symbol, enforcing constraints
+class SymbolPartsSelection {
+  public:
+	inline SymbolPartsSelection() : root(nullptr) {}
+	
+	void setSymbol(const SymbolP& symbol);
+	
+	/// Clear selection
+	void clear();	
+	/// Select a part or toggle its selection
+	/** Return true if the selection changed */
+	bool select(const SymbolPartP& part, SelectMode mode = SELECT_OVERRIDE);
+	/// Toggle the selection of the parts in a rectangle (a,b) or (a,c) but not in both
+	/** Return true if the selection changed */
+	bool selectRect(const Vector2D& a, const Vector2D& b, const Vector2D& c);
+	
+	/// Find a part by position (not just in the selection!)
+	/** Returns SymbolPartP() if nothing is found.
+	 *  Does not select inside groups unless the part in question is already selected.
+	 */
+	SymbolPartP find(const Vector2D& position) const;
+	
+	/// Get the selection
+	inline const set<SymbolPartP>& get() const { return selection; }
+	
+	/// Is the selection empty?
+	inline bool empty() const { return selection.empty(); }
+	/// Number of items selected
+	inline size_t size() const { return selection.size(); }
+	/// Is a part selected?
+	inline bool selected(const SymbolPartP& part) const {
+		return selection.find(part) != selection.end();
+	}
+	
+	/// Get any SymbolShape if there is one selected
+	SymbolShapeP getAShape() const;
+	
+  private:
+	Symbol* root;
+	set<SymbolPartP> selection;
+	
+	/// Find a part, in some root
+	SymbolPartP find(const SymbolPartP& part, const Vector2D& pos) const;
+	/// Select rect for some parent
+	bool selectRect(const SymbolGroup& parent, const Vector2D& a, const Vector2D& b, const Vector2D& c);
+	
+	/// Make sure not both a parent and its child/decendant are selected
+	void clearChildren (SymbolPart* part);
+	/// Is a part another's ancestor?
+	static bool isAncestor(SymbolPart* ancestor, SymbolPart* part);
+};
+
+// ----------------------------------------------------------------------------- : EOF
+#endif