Added GraphicsScrollbar (still in development phase) for big graphics scene. Standard QScrollBar's int value gets overflow very fast when doing zoom-in for graphics scene. So it is necessary to create a Scrollbar with double value.

profiler_gui/CMakeLists.txt

@@ -11,16 +11,18 @@ find_package(Qt5Widgets REQUIRED)
 
 add_executable(${PROJECT_NAME}
     main.cpp
-    treemodel.h
-    treemodel.cpp
-    treeitem.h
-    treeitem.cpp
     blocks_graphics_view.h
     blocks_graphics_view.cpp
     blocks_tree_widget.h
     blocks_tree_widget.cpp
+    graphics_scrollbar.h
+    graphics_scrollbar.cpp
     main_window.h
     main_window.cpp
+    treemodel.h
+    treemodel.cpp
+    treeitem.h
+    treeitem.cpp
 )
 
 target_link_libraries(${PROJECT_NAME} Qt5::Widgets easy_profiler)

profiler_gui/graphics_scrollbar.cpp

@@ -0,0 +1,139 @@
+/************************************************************************
+* file name         : graphics_scrollbar.cpp
+* ----------------- :
+* creation time     : 2016/07/04
+* copyright         : (c) 2016 Victor Zarubkin
+* author            : Victor Zarubkin
+* email             : v.s.zarubkin@gmail.com
+* ----------------- :
+* description       : .
+* ----------------- :
+* change log        : * 2016/07/04 Victor Zarubkin: Initial commit.
+*                   :
+*                   : *
+* ----------------- :
+* license           : TODO: add license text
+************************************************************************/
+
+#include <QScrollBar>
+#include "graphics_scrollbar.h"
+
+//////////////////////////////////////////////////////////////////////////
+
+auto const clamp = [](double _minValue, double _value, double _maxValue)
+{
+    return (_value < _minValue ? _minValue : (_value > _maxValue ? _maxValue : _value));
+};
+
+//////////////////////////////////////////////////////////////////////////
+
+GraphicsHorizontalSlider::GraphicsHorizontalSlider() : Parent(), m_halfwidth(0)
+{
+    setWidth(40);
+    setBrush(Qt::SolidPattern);
+}
+
+GraphicsHorizontalSlider::~GraphicsHorizontalSlider()
+{
+
+}
+
+double GraphicsHorizontalSlider::width() const
+{
+    return m_halfwidth * 2.0;
+}
+
+double GraphicsHorizontalSlider::halfwidth() const
+{
+    return m_halfwidth;
+}
+
+void GraphicsHorizontalSlider::setWidth(double _width)
+{
+    m_halfwidth = _width * 0.5;
+    setPolygon(QRectF(-m_halfwidth, -10, _width, 20));
+}
+
+void GraphicsHorizontalSlider::setHalfwidth(double _halfwidth)
+{
+    m_halfwidth = _halfwidth;
+    setPolygon(QRectF(-m_halfwidth, -10, m_halfwidth * 2.0, 20));
+}
+
+void GraphicsHorizontalSlider::setColor(QRgb _color)
+{
+    auto b = brush();
+    b.setColor(_color);
+    setBrush(b);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+GraphicsHorizontalScrollbar::GraphicsHorizontalScrollbar(QWidget* _parent)
+    : Parent(_parent)
+    , m_minimumValue(0)
+    , m_maximumValue(500)
+    , m_value(10)
+    , m_slider(nullptr)
+{
+    setCacheMode(QGraphicsView::CacheNone);
+    setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
+    setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+    setOptimizationFlag(QGraphicsView::DontSavePainterState, true);
+
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    setMinimumHeight(20);
+    setMaximumHeight(20);
+
+    auto selfScene = new QGraphicsScene(this);
+    selfScene->setSceneRect(0, -10, 500, 20);
+    setScene(selfScene);
+
+    m_slider = new GraphicsHorizontalSlider();
+    m_slider->setPos(10, 0);
+    m_slider->setColor(0xffff0404);
+    selfScene->addItem(m_slider);
+
+    centerOn(10, 0);
+}
+
+GraphicsHorizontalScrollbar::~GraphicsHorizontalScrollbar()
+{
+
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+double GraphicsHorizontalScrollbar::minimum() const
+{
+    return m_minimumValue;
+}
+
+double GraphicsHorizontalScrollbar::maximum() const
+{
+    return m_maximumValue;
+}
+
+double GraphicsHorizontalScrollbar::value() const
+{
+    return m_value;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+void GraphicsHorizontalScrollbar::setValue(double _value)
+{
+    m_value = clamp(m_minimumValue + m_slider->halfwidth(), _value, m_maximumValue - m_slider->halfwidth());
+    emit valueChanged(m_value);
+}
+
+void GraphicsHorizontalScrollbar::setRange(double _minValue, double _maxValue)
+{
+    m_minimumValue = _minValue;
+    m_maximumValue = _maxValue;
+    setValue(m_value);
+}
+
+//////////////////////////////////////////////////////////////////////////

profiler_gui/graphics_scrollbar.h

@@ -0,0 +1,86 @@
+/************************************************************************
+* file name         : graphics_scrollbar.h
+* ----------------- : 
+* creation time     : 2016/07/04
+* copyright         : (c) 2016 Victor Zarubkin
+* author            : Victor Zarubkin
+* email             : v.s.zarubkin@gmail.com
+* ----------------- : 
+* description       : .
+* ----------------- : 
+* change log        : * 2016/07/04 Victor Zarubkin: Initial commit.
+*                   :
+*                   : * 
+* ----------------- : 
+* license           : TODO: add license text
+************************************************************************/
+
+#ifndef EASY_PROFILER__GRAPHICS_SCROLLBAR__H
+#define EASY_PROFILER__GRAPHICS_SCROLLBAR__H
+
+#include <stdlib.h>
+#include <QGraphicsView>
+#include <QGraphicsScene>
+#include <QGraphicsPolygonItem>
+
+//////////////////////////////////////////////////////////////////////////
+
+class GraphicsHorizontalSlider : public QGraphicsPolygonItem
+{
+    typedef QGraphicsPolygonItem     Parent;
+    typedef GraphicsHorizontalSlider   This;
+
+private:
+
+    double m_halfwidth;
+
+public:
+
+    GraphicsHorizontalSlider();
+    virtual ~GraphicsHorizontalSlider();
+
+    double width() const;
+    double halfwidth() const;
+
+    void setWidth(double _width);
+    void setHalfwidth(double _halfwidth);
+
+    void setColor(QRgb _color);
+
+}; // END of class GraphicsHorizontalSlider.
+
+//////////////////////////////////////////////////////////////////////////
+
+class GraphicsHorizontalScrollbar : public QGraphicsView
+{
+    Q_OBJECT
+
+private:
+
+    typedef QGraphicsView     Parent;
+    typedef GraphicsHorizontalScrollbar   This;
+
+    double m_minimumValue, m_maximumValue, m_value;
+    GraphicsHorizontalSlider* m_slider;
+
+public:
+
+    GraphicsHorizontalScrollbar(QWidget* _parent = nullptr);
+    virtual ~GraphicsHorizontalScrollbar();
+
+    double minimum() const;
+    double maximum() const;
+    double value() const;
+
+    void setValue(double _value);
+    void setRange(double _minValue, double _maxValue);
+
+signals:
+
+    void valueChanged(double _value) const;
+
+}; // END of class GraphicsHorizontalScrollbar.
+
+//////////////////////////////////////////////////////////////////////////
+
+#endif // EASY_PROFILER__GRAPHICS_SCROLLBAR__H

profiler_gui/main_window.cpp

@@ -28,6 +28,7 @@
 #include "main_window.h"
 #include "blocks_tree_widget.h"
 #include "blocks_graphics_view.h"
+//#include "graphics_scrollbar.h"
 
 //////////////////////////////////////////////////////////////////////////
 
@@ -52,7 +53,14 @@ ProfMainWindow::ProfMainWindow() : QMainWindow(), m_treeWidget(nullptr), m_graph
     m_treeWidget->setAllowedAreas(Qt::AllDockWidgetAreas);
     m_treeWidget->setWidget(treeWidget);
 
+    //auto bar = new GraphicsHorizontalScrollbar();
+    //auto dock = new QDockWidget();
+    //dock->setMinimumHeight(20);
+    //dock->setAllowedAreas(Qt::AllDockWidgetAreas);
+    //dock->setWidget(bar);
+
     addDockWidget(Qt::TopDockWidgetArea, m_graphicsView);
+    //addDockWidget(Qt::TopDockWidgetArea, dock);
     addDockWidget(Qt::BottomDockWidgetArea, m_treeWidget);
 
     auto actionOpen = new QAction("Open", nullptr);