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support key and mouse event listeners for widgets - to allow easy overriding key and mouse processing

This commit is contained in:
Vadim Lopatin 2014-12-04 09:47:37 +03:00
parent 819bbdabdd
commit a5c4a0f59d
1 changed files with 18 additions and 0 deletions
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18
src/dlangui/widgets/widget.d
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@ -81,6 +81,16 @@ interface OnFocusHandler {
bool onFocusChanged(Widget source, bool focused);
}
/// interface - slot for onKey
interface OnKeyHandler {
bool onKey(Widget source, KeyEvent event);
}
/// interface - slot for onMouse
interface OnMouseHandler {
bool onMouse(Widget source, MouseEvent event);
}
/// focus movement options
enum FocusMovement {
/// no focus movement
@ -880,6 +890,8 @@ class Widget {
/// process key event, return true if event is processed.
bool onKeyEvent(KeyEvent event) {
if (onKeyListener.assigned && onKeyListener(this, event))
return true; // processed by external handler
if (event.action == KeyAction.KeyDown) {
Action action = findKeyAction(event.keyCode, event.flags & (KeyFlag.Shift | KeyFlag.Alt | KeyFlag.Control));
if (action !is null) {
@ -910,6 +922,8 @@ class Widget {
/// process mouse event; return true if event is processed by widget.
bool onMouseEvent(MouseEvent event) {
if (onMouseListener.assigned && onMouseListener(this, event))
return true; // processed by external handler
//Log.d("onMouseEvent ", id, " ", event.action, " (", event.x, ",", event.y, ")");
// support onClick
if (canClick) {
@ -977,6 +991,10 @@ class Widget {
Signal!OnCheckHandler onCheckChangeListener;
/// focus state change event listener (bool delegate(Widget, bool))
Signal!OnFocusHandler onFocusChangeListener;
/// key event listener (bool delegate(Widget, KeyEvent)) - return true if event is processed by handler
Signal!OnKeyHandler onKeyListener;
/// mouse event listener (bool delegate(Widget, MouseEvent)) - return true if event is processed by handler
Signal!OnMouseHandler onMouseListener;
/// helper function to add onCheckChangeListener in method chain
Widget addOnClickListener(bool delegate(Widget) listener) {