From 81238c98c2aa0509ddb832b4959949cad161e385 2012-04-12 09:37:59
From: Tero Ahola <tero.ahola@digia.com>
Date: 2012-04-12 09:37:59
Subject: [PATCH] Added drop shadow effect for light themes

---

diff --git a/src/chartbackground.cpp b/src/chartbackground.cpp
index 7a2d1fa..76be154 100644
--- a/src/chartbackground.cpp
+++ b/src/chartbackground.cpp
@@ -23,11 +23,14 @@
 #include <QPen>
 #include <QBrush>
 #include <QPainter>
+#include <QGraphicsDropShadowEffect>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
-ChartBackground::ChartBackground(QGraphicsItem* parent):QGraphicsRectItem(parent),
-m_diameter(15)
+ChartBackground::ChartBackground(QGraphicsItem* parent) :
+    QGraphicsRectItem(parent),
+    m_diameter(15),
+    m_dropShadow(0)
 {
 }
 
@@ -36,6 +39,21 @@ ChartBackground::~ChartBackground()
 
 }
 
+void ChartBackground::setDropShadowEnabled(bool enabled)
+{
+    if (enabled) {
+        if (!m_dropShadow) {
+            m_dropShadow = new QGraphicsDropShadowEffect();
+            m_dropShadow->setBlurRadius(10);
+            m_dropShadow->setOffset(5, 5);
+            setGraphicsEffect(m_dropShadow);
+        }
+    } else {
+        delete m_dropShadow;
+        m_dropShadow = 0;
+    }
+}
+
 void ChartBackground::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
    Q_UNUSED(option);
diff --git a/src/chartbackground_p.h b/src/chartbackground_p.h
index 93870ce..0525db6 100644
--- a/src/chartbackground_p.h
+++ b/src/chartbackground_p.h
@@ -24,6 +24,7 @@
 #include "qchartglobal.h"
 #include <QGraphicsRectItem>
 
+class QGraphicsDropShadowEffect;
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
 class ChartBackground: public QGraphicsRectItem
@@ -34,7 +35,8 @@ public:
 
     void setDimeter(int dimater);
     int diameter() const;
-
+    void setDropShadowEnabled(bool enabled);
+    bool isDropShadowEnabled() {return m_dropShadow != 0;}
 
 protected:
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
@@ -44,8 +46,8 @@ private:
     int roundness(qreal size) const;
 
 private:
-     int m_diameter;
-
+    int m_diameter;
+    QGraphicsDropShadowEffect *m_dropShadow;
 };
 
 QTCOMMERCIALCHART_END_NAMESPACE
diff --git a/src/charttheme.cpp b/src/charttheme.cpp
index e3f0f67..d395d64 100644
--- a/src/charttheme.cpp
+++ b/src/charttheme.cpp
@@ -20,6 +20,7 @@
 
 #include "charttheme_p.h"
 #include "qchart.h"
+#include "qchart_p.h"
 #include "qchartview.h"
 #include "qlegend.h"
 #include "qchartaxis.h"
@@ -69,6 +70,7 @@ ChartTheme::ChartTheme(QChart::ChartTheme id) :
     m_backgroundShadesPen(Qt::NoPen),
     m_backgroundShadesBrush(Qt::NoBrush),
     m_backgroundShades(BackgroundShadesNone),
+    m_backgroundDropShadowEnabled(false),
     m_gridLinePen(QPen(QRgb(0x000000))),
     m_force(false)
 {
@@ -107,6 +109,7 @@ void ChartTheme::decorate(QChart *chart)
         chart->setBackgroundBrush(m_chartBackgroundGradient);
     chart->setTitleFont(m_masterFont);
     chart->setTitleBrush(m_titleBrush);
+    chart->setBackgroundDropShadowEnabled(m_backgroundDropShadowEnabled);
 }
 
 void ChartTheme::decorate(QLegend *legend)
@@ -118,7 +121,6 @@ void ChartTheme::decorate(QLegend *legend)
         legend->setPen(Qt::NoPen);
     }
 
-
     if (brush == legend->brush() ||  m_force) {
         legend->setBrush(m_chartBackgroundGradient);
     }
diff --git a/src/charttheme_p.h b/src/charttheme_p.h
index eae6593..019fdf6 100644
--- a/src/charttheme_p.h
+++ b/src/charttheme_p.h
@@ -92,6 +92,7 @@ protected:
     QPen m_backgroundShadesPen;
     QBrush m_backgroundShadesBrush;
     BackgroundShadesMode m_backgroundShades;
+    bool m_backgroundDropShadowEnabled;
     QPen m_gridLinePen;
     bool m_force;
 };
diff --git a/src/qchart.cpp b/src/qchart.cpp
index afb7271..97eee52 100644
--- a/src/qchart.cpp
+++ b/src/qchart.cpp
@@ -379,10 +379,26 @@ void QChart::setBackgroundVisible(bool visible)
 bool QChart::isBackgroundVisible() const
 {
     //TODO: refactor me
-    if (!d_ptr->m_presenter->m_backgroundItem) return false;
+    if (!d_ptr->m_presenter->m_backgroundItem)
+        return false;
+
     return d_ptr->m_presenter->m_backgroundItem->isVisible();
 }
 
+void QChart::setBackgroundDropShadowEnabled(bool enabled)
+{
+    d_ptr->m_presenter->createChartBackgroundItem();
+    d_ptr->m_presenter->m_backgroundItem->setDropShadowEnabled(enabled);
+}
+
+bool QChart::isBackgroundDropShadowEnabled() const
+{
+    if (!d_ptr->m_presenter->m_backgroundItem)
+        return false;
+
+    return d_ptr->m_presenter->m_backgroundItem->isDropShadowEnabled();
+}
+
 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
 QChartPrivate::QChartPrivate():
diff --git a/src/qchart.h b/src/qchart.h
index 8194eb8..2a45700 100644
--- a/src/qchart.h
+++ b/src/qchart.h
@@ -81,9 +81,10 @@ public:
     QBrush backgroundBrush() const;
     void setBackgroundPen(const QPen &pen);
     QPen backgroundPen() const;
-
     void setBackgroundVisible(bool visible = true);
     bool isBackgroundVisible() const;
+    void setBackgroundDropShadowEnabled(bool enabled = true);
+    bool isBackgroundDropShadowEnabled() const;
 
     void setAnimationOptions(AnimationOptions options);
     AnimationOptions animationOptions() const;
diff --git a/src/themes/chartthemeblueicy_p.h b/src/themes/chartthemeblueicy_p.h
index 3a75acb..7a5dc49 100644
--- a/src/themes/chartthemeblueicy_p.h
+++ b/src/themes/chartthemeblueicy_p.h
@@ -44,6 +44,7 @@ public:
         backgroundGradient.setColorAt(1.0, QRgb(0xffffff));
         backgroundGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
         m_chartBackgroundGradient = backgroundGradient;
+        m_backgroundDropShadowEnabled = true;
 
         // Axes and other
         m_titleBrush = QBrush(QRgb(0x404044));
diff --git a/src/themes/chartthemehighcontrast_p.h b/src/themes/chartthemehighcontrast_p.h
index a45b574..e6719df 100644
--- a/src/themes/chartthemehighcontrast_p.h
+++ b/src/themes/chartthemehighcontrast_p.h
@@ -44,6 +44,7 @@ public:
         backgroundGradient.setColorAt(1.0, QRgb(0xffffff));
         backgroundGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
         m_chartBackgroundGradient = backgroundGradient;
+        m_backgroundDropShadowEnabled = true;
 
         // Axes and other
         m_titleBrush = QBrush(QRgb(0x181818));
diff --git a/src/themes/chartthemelight_p.h b/src/themes/chartthemelight_p.h
index bbbe922..22e68a6 100644
--- a/src/themes/chartthemelight_p.h
+++ b/src/themes/chartthemelight_p.h
@@ -44,6 +44,7 @@ public:
         backgroundGradient.setColorAt(1.0, QRgb(0xffffff));
         backgroundGradient.setCoordinateMode(QGradient::ObjectBoundingMode);
         m_chartBackgroundGradient = backgroundGradient;
+        m_backgroundDropShadowEnabled = true;
 
         // Axes and other
         m_axisLinePen = QPen(0xd6d6d6);