diff widgets/Panner.cpp @ 173:9c40dc10c88c

* Rename the existing Panner to Overview (big duh!)
* Fixes to the new Panner.

--- a/widgets/Panner.cpp	Wed Oct 18 16:38:30 2006 +0000
+++ b/widgets/Panner.cpp	Thu Oct 19 09:57:27 2006 +0000
@@ -27,7 +27,11 @@
     m_rectX(0),
     m_rectY(0),
     m_rectWidth(1),
-    m_rectHeight(1)
+    m_rectHeight(1),
+    m_defaultCentreX(0),
+    m_defaultCentreY(0),
+    m_defaultsSet(false),
+    m_clicked(false)
 {
 }
 
@@ -38,38 +42,81 @@
 void
 Panner::mousePressEvent(QMouseEvent *e)
 {
+    if (e->button() == Qt::LeftButton) {
+        m_clicked = true;
+        m_clickPos = e->pos();
+        m_dragStartX = m_rectX;
+        m_dragStartY = m_rectY;
+    } else if (e->button() == Qt::MidButton) {
+        resetToDefault();
+    }
 }
 
 void
 Panner::mouseDoubleClickEvent(QMouseEvent *e)
 {
+    resetToDefault();
 }
 
 void
 Panner::mouseMoveEvent(QMouseEvent *e)
 {
+    if (!m_clicked) return;
+
+    float dx = float(e->pos().x() - m_clickPos.x()) / float(width());
+    float dy = float(e->pos().y() - m_clickPos.y()) / float(height());
+    
+    m_rectX = m_dragStartX + dx;
+    m_rectY = m_dragStartY + dy;
+    
+    normalise();
+    emitAndUpdate();
 }
 
 void
 Panner::mouseReleaseEvent(QMouseEvent *e)
 {
+    if (!m_clicked) return;
+
+    mouseMoveEvent(e);
+    m_clicked = false;
 }
 
 void
 Panner::wheelEvent(QWheelEvent *e)
 {
+    if (e->delta() > 0) {
+        m_rectY += 0.1;
+    } else {
+        m_rectY -= 0.1;
+    }
+
+    normalise();
+    emitAndUpdate();
 }
 
 void
 Panner::paintEvent(QPaintEvent *e)
 {
     QPainter paint(this);
-    paint.fillRect(rect(), palette().background().color());
     paint.setRenderHint(QPainter::Antialiasing, false);
+
+    QColor bg(palette().background().color());
+    bg.setAlpha(80);
+
     paint.setPen(palette().dark().color());
-    paint.setBrush(palette().highlight().color());
-    paint.drawRect(QRectF(width() * m_rectX, height() - height() * m_rectY,
-                          width() * m_rectWidth, height() * m_rectHeight));
+    paint.setBrush(bg);
+    paint.drawRect(0, 0, width(), height());
+
+    QColor hl(palette().highlight().color());
+    hl.setAlpha(80);
+
+    paint.setBrush(hl);
+
+    paint.drawRect(lrintf(width() * m_rectX),
+                   lrintf(height() * m_rectY),
+                   lrintf(width() * m_rectWidth),
+                   lrintf(height() * m_rectHeight));
 }
 
 void
@@ -81,13 +128,19 @@
     if (m_rectX < 0) m_rectX = 0;
     if (m_rectY + m_rectHeight > 1.0) m_rectY = 1.0 - m_rectHeight;
     if (m_rectY < 0) m_rectY = 0;
+
+    if (!m_defaultsSet) {
+        m_defaultCentreX = centreX();
+        m_defaultCentreY = centreY();
+        m_defaultsSet = true;
+    }
 }
 
 void
 Panner::emitAndUpdate()
 {
     emit rectExtentsChanged(m_rectX, m_rectY, m_rectWidth, m_rectHeight);
-    emit rectCentreMoved(m_rectX + (m_rectWidth/2), m_rectY + (m_rectHeight/2));
+    emit rectCentreMoved(centreX(), centreY());
     update();
 }  
 
@@ -100,10 +153,12 @@
         m_rectHeight == height) {
         return;
     }
+
     m_rectX = x0;
     m_rectY = y0;
     m_rectWidth = width;
     m_rectHeight = height;
+
     normalise();
     emitAndUpdate();
 }
@@ -139,7 +194,7 @@
 void
 Panner::setRectCentreY(float y)
 {
-    float y0 = y - m_rectWidth/2;
+    float y0 = y - m_rectHeight/2;
     if (y0 == m_rectY) return;
     m_rectY = y0;
     normalise();
@@ -152,5 +207,24 @@
     return QSize(30, 30);
 }
 
+void
+Panner::setDefaultRectCentre(float cx, float cy)
+{
+    m_defaultCentreX = cx;
+    m_defaultCentreY = cy;
+    m_defaultsSet = true;
+}
 
+void
+Panner::resetToDefault()
+{
+    float x0 = m_defaultCentreX - m_rectWidth/2;
+    float y0 = m_defaultCentreY - m_rectHeight/2;
+    if (x0 == m_rectX && y0 == m_rectY) return;
+    m_rectX = x0;
+    m_rectY = y0;
+    normalise();
+    emitAndUpdate();
+}
 
+