[krita/kazakov/svg-loading] plugins/tools/selectiontools: [FEATURE] Ctrl-key continued mode for Outline Selection Tool

[Dmitry Kazakov]

Git commit 1f91293390d7c2316ab439216f7fec7c4ecb7d07 by Dmitry Kazakov.
Committed on 21/12/2016 at 11:04.
Pushed by dkazakov into branch 'kazakov/svg-loading'.

[FEATURE] Ctrl-key continued mode for Outline Selection Tool

This is a special mode of the outline selection tool. If
you press Ctrl while dragging the cursor, you can raise
the stylus from the tablet surface and have a bit of rest.
Then just continue the selection from the arbitrary point
and the new selection segment will be connected to the
older one with a straight line.

This shortcut basically temporary switches outline tool
into polygonal tool. That is extremely useful for painters
who do flat-filled art.

CC:kimageshop at kde.org

M  +70   -11   plugins/tools/selectiontools/kis_tool_select_outline.cc
M  +9    -1    plugins/tools/selectiontools/kis_tool_select_outline.h

https://commits.kde.org/krita/1f91293390d7c2316ab439216f7fec7c4ecb7d07

diff --git a/plugins/tools/selectiontools/kis_tool_select_outline.cc b/plugins/tools/selectiontools/kis_tool_select_outline.cc
index 4ff3063ac89..e938325bace 100644
--- a/plugins/tools/selectiontools/kis_tool_select_outline.cc
+++ b/plugins/tools/selectiontools/kis_tool_select_outline.cc
@@ -59,7 +59,7 @@ KisToolSelectOutline::KisToolSelectOutline(KoCanvasBase * canvas)
     : KisToolSelect(canvas,
                     KisCursor::load("tool_outline_selection_cursor.png", 5, 5),
                     i18n("Outline Selection")),
-      m_paintPath(new QPainterPath())
+      m_continuedMode(false)
 {
     connect(&m_widgetHelper, &KisSelectionToolConfigWidgetHelper::selectionActionChanged,
             this, &KisToolSelectOutline::setSelectionAction);
@@ -67,7 +67,37 @@ KisToolSelectOutline::KisToolSelectOutline(KoCanvasBase * canvas)
 
 KisToolSelectOutline::~KisToolSelectOutline()
 {
-    delete m_paintPath;
+}
+
+void KisToolSelectOutline::keyPressEvent(QKeyEvent *event)
+{
+    if (event->key() == Qt::Key_Control) {
+        m_continuedMode = true;
+    }
+
+    KisToolSelect::keyPressEvent(event);
+}
+
+void KisToolSelectOutline::keyReleaseEvent(QKeyEvent *event)
+{
+    if (event->key() == Qt::Key_Control ||
+        !(event->modifiers() & Qt::ControlModifier)) {
+
+        m_continuedMode = false;
+        if (mode() != PAINT_MODE && !m_points.isEmpty()) {
+            finishSelectionAction();
+        }
+    }
+
+    KisToolSelect::keyReleaseEvent(event);
+}
+
+void KisToolSelectOutline::mouseMoveEvent(KoPointerEvent *event)
+{
+    m_lastCursorPos = convertToPixelCoord(event);
+    if (m_continuedMode && mode() != PAINT_MODE) {
+        updateContinuedMode();
+    }
 }
 
 void KisToolSelectOutline::beginPrimaryAction(KoPointerEvent *event)
@@ -81,10 +111,13 @@ void KisToolSelectOutline::beginPrimaryAction(KoPointerEvent *event)
 
     setMode(KisTool::PAINT_MODE);
 
-    m_points.clear();
-    m_points.append(convertToPixelCoord(event));
-    m_paintPath->moveTo(pixelToView(convertToPixelCoord(event)));
+    if (m_continuedMode && !m_points.isEmpty()) {
+        m_paintPath.lineTo(pixelToView(convertToPixelCoord(event)));
+    } else {
+        m_paintPath.moveTo(pixelToView(convertToPixelCoord(event)));
+    }
 
+    m_points.append(convertToPixelCoord(event));
 }
 
 void KisToolSelectOutline::continuePrimaryAction(KoPointerEvent *event)
@@ -93,7 +126,7 @@ void KisToolSelectOutline::continuePrimaryAction(KoPointerEvent *event)
     KisToolSelectBase::continuePrimaryAction(event);
 
     QPointF point = convertToPixelCoord(event);
-    m_paintPath->lineTo(pixelToView(point));
+    m_paintPath.lineTo(pixelToView(point));
     m_points.append(point);
     updateFeedback();
 
@@ -107,6 +140,13 @@ void KisToolSelectOutline::endPrimaryAction(KoPointerEvent *event)
     KisToolSelectBase::endPrimaryAction(event);
     setMode(KisTool::HOVER_MODE);
 
+    if (!m_continuedMode) {
+        finishSelectionAction();
+    }
+}
+
+void KisToolSelectOutline::finishSelectionAction()
+{
     KisCanvas2 * kisCanvas = dynamic_cast<KisCanvas2*>(canvas());
     KIS_ASSERT_RECOVER_RETURN(kisCanvas);
     kisCanvas->updateCanvas();
@@ -154,16 +194,21 @@ void KisToolSelectOutline::endPrimaryAction(KoPointerEvent *event)
     }
 
     m_points.clear();
-    delete m_paintPath;
-    m_paintPath = new QPainterPath();
+    m_paintPath = QPainterPath();
 }
 
 void KisToolSelectOutline::paint(QPainter& gc, const KoViewConverter &converter)
 {
     Q_UNUSED(converter);
 
-    if (mode() == KisTool::PAINT_MODE && !m_points.isEmpty()) {
-            paintToolOutline(&gc, *m_paintPath);
+    if ((mode() == KisTool::PAINT_MODE || m_continuedMode) &&
+        !m_points.isEmpty()) {
+
+        QPainterPath outline = m_paintPath;
+        if (m_continuedMode && mode() != KisTool::PAINT_MODE) {
+            outline.lineTo(pixelToView(m_lastCursorPos));
+        }
+        paintToolOutline(&gc, outline);
     }
 }
 
@@ -175,7 +220,19 @@ void KisToolSelectOutline::updateFeedback()
         qint32 lastPointIndex = m_points.count() - 1;
 
         QRectF updateRect = QRectF(m_points[lastPointIndex - 1], m_points[lastPointIndex]).normalized();
-        updateRect.adjust(-FEEDBACK_LINE_WIDTH, -FEEDBACK_LINE_WIDTH, FEEDBACK_LINE_WIDTH, FEEDBACK_LINE_WIDTH);
+        updateRect = kisGrowRect(updateRect, FEEDBACK_LINE_WIDTH);
+
+        updateCanvasPixelRect(updateRect);
+    }
+}
+
+void KisToolSelectOutline::updateContinuedMode()
+{
+    if (!m_points.isEmpty()) {
+        qint32 lastPointIndex = m_points.count() - 1;
+
+        QRectF updateRect = QRectF(m_points[lastPointIndex - 1], m_lastCursorPos).normalized();
+        updateRect = kisGrowRect(updateRect, FEEDBACK_LINE_WIDTH);
 
         updateCanvasPixelRect(updateRect);
     }
@@ -187,6 +244,8 @@ void KisToolSelectOutline::deactivate()
     KIS_ASSERT_RECOVER_RETURN(kisCanvas);
     kisCanvas->updateCanvas();
 
+    m_continuedMode = false;
+
     KisTool::deactivate();
 }
 
diff --git a/plugins/tools/selectiontools/kis_tool_select_outline.h b/plugins/tools/selectiontools/kis_tool_select_outline.h
index bbda8baabdc..c0f492acd64 100644
--- a/plugins/tools/selectiontools/kis_tool_select_outline.h
+++ b/plugins/tools/selectiontools/kis_tool_select_outline.h
@@ -43,6 +43,10 @@ public:
     void endPrimaryAction(KoPointerEvent *event);
     virtual void paint(QPainter& gc, const KoViewConverter &converter);
 
+    void keyPressEvent(QKeyEvent *event);
+    void keyReleaseEvent(QKeyEvent *event);
+
+    void mouseMoveEvent(KoPointerEvent *event);
 
 public Q_SLOTS:
     virtual void deactivate();
@@ -52,11 +56,15 @@ protected:
     using KisToolSelectBase::m_widgetHelper;
 
 private:
+    void finishSelectionAction();
     void updateFeedback();
+    void updateContinuedMode();
     void updateCanvas();
 
-    QPainterPath * m_paintPath;
+    QPainterPath m_paintPath;
     vQPointF m_points;
+    bool m_continuedMode;
+    QPointF m_lastCursorPos;
 };
 
 class KisToolSelectOutlineFactory : public KoToolFactoryBase