From f68cce12b14abba9c2faae6dcc490f0fbfab4e14 Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Tue, 28 Jun 2016 15:47:34 +0300
Subject: [PATCH] triple mouse click support; select whole line on mouse triple
 click - close #193

---
 src/dlangui/core/events.d     | 22 +++++++++++++++++++++-
 src/dlangui/widgets/editors.d | 21 ++++++++++++++++++++-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/src/dlangui/core/events.d b/src/dlangui/core/events.d
index d8be0cb2..f54f5bf0 100644
--- a/src/dlangui/core/events.d
+++ b/src/dlangui/core/events.d
@@ -722,6 +722,8 @@ __gshared long DOUBLE_CLICK_THRESHOLD_MS = 400;
 
 /// Mouse button state details for MouseEvent
 struct ButtonDetails {
+    /// Clock.currStdTime() for down event of this button (0 if button is up) set after double click to time when first click occured.
+    protected long  _prevDownTs;
     /// Clock.currStdTime() for down event of this button (0 if button is up).
     protected long  _downTs;
     /// Clock.currStdTime() for up event of this button (0 if button is still down).
@@ -734,12 +736,19 @@ struct ButtonDetails {
     protected ushort _downFlags;
     /// true if button is made down shortly after up - valid if button is down
     protected bool _doubleClick;
+    /// true if button is made down twice shortly after up - valid if button is down
+    protected bool _tripleClick;
 
     /// Returns true if button is made down shortly after up
     @property bool doubleClick() {
         return _doubleClick;
     }
 
+    /// Returns true if button is made down twice shortly after up
+    @property bool tripleClick() {
+        return _tripleClick;
+    }
+
 
 
     void reset() {
@@ -759,14 +768,18 @@ struct ButtonDetails {
         _upTs = 0;
         _downTs = std.datetime.Clock.currStdTime;
         long downIntervalMs = (_downTs - oldDownTs) / 10000;
+        long prevDownIntervalMs = (_downTs - _prevDownTs) / 10000;
         //Log.d("Button down ", x, ",", y, " _downTs=", _downTs, " _upTs=", _upTs, " downInterval=", downIntervalMs);
-        _doubleClick = (oldDownTs && downIntervalMs < DOUBLE_CLICK_THRESHOLD_MS);
+        _tripleClick = (prevDownIntervalMs && prevDownIntervalMs < DOUBLE_CLICK_THRESHOLD_MS * 2);
+        _doubleClick = !_tripleClick && (oldDownTs && downIntervalMs < DOUBLE_CLICK_THRESHOLD_MS);
+        _prevDownTs = _doubleClick ? oldDownTs : 0;
     }
     /// update for button up
     void up(short x, short y, ushort flags) {
         static import std.datetime;
         //Log.d("Button up ", x, ",", y, " _downTs=", _downTs, " _upTs=", _upTs);
         _doubleClick = false;
+        _tripleClick = false;
         _upTs = std.datetime.Clock.currStdTime;
     }
     /// returns true if button is currently pressed
@@ -860,6 +873,13 @@ class MouseEvent {
         return buttonDetails.doubleClick;
     }
 
+    /// Returns true for ButtonDown event when button is pressed third time in short interval after pressing first time
+    @property bool tripleClick() {
+        if (_action != MouseAction.ButtonDown)
+            return false;
+        return buttonDetails.tripleClick;
+    }
+
     /// get event tracking widget to override
     @property Widget trackingWidget() { return _trackingWidget; }
     /// returns mouse button tracking flag
diff --git a/src/dlangui/widgets/editors.d b/src/dlangui/widgets/editors.d
index 1b9bc3f3..bd8c08cf 100644
--- a/src/dlangui/widgets/editors.d
+++ b/src/dlangui/widgets/editors.d
@@ -1116,6 +1116,23 @@ class EditWidgetBase : ScrollWidgetBase, EditableContentListener, MenuItemAction
         }
     }
 
+    protected void selectLineByMouse(int x, int y, bool onSameLineOnly = true) {
+        TextPosition oldCaretPos = _caretPos;
+        TextPosition newPos = clientToTextPos(Point(x,y));
+        if (onSameLineOnly && newPos.line != oldCaretPos.line)
+            return; // different lines
+        TextRange r = content.lineRange(newPos.line);
+        if (r.start < r.end) {
+            _selectionRange = r;
+            _caretPos = r.end;
+            invalidate();
+            requestActionsUpdate();
+        } else {
+            _caretPos = newPos;
+            updateSelectionAfterCursorMovement(oldCaretPos, false);
+        }
+    }
+
     protected void updateCaretPositionByMouse(int x, int y, bool selecting) {
         TextPosition oldCaretPos = _caretPos;
         TextPosition newPos = clientToTextPos(Point(x,y));
@@ -1709,7 +1726,9 @@ class EditWidgetBase : ScrollWidgetBase, EditableContentListener, MenuItemAction
             setFocus();
             startCaretBlinking();
             cancelHoverTimer();
-            if (event.doubleClick) {
+            if (event.tripleClick) {
+                selectLineByMouse(event.x - _clientRect.left, event.y - _clientRect.top);
+            } else if (event.doubleClick) {
                 selectWordByMouse(event.x - _clientRect.left, event.y - _clientRect.top);
             } else {
                 auto doSelect = cast(bool)(event.keyFlags & MouseFlag.Shift);