feat: Build the custom redraw frame, eg: QScrollBar

搭建自定义QStyle重绘的框架，使用系统自带的和滚动条QScrollBar为示范

QtCustomStyleEx/ExCustomStyle.cpp

@@ -4,7 +4,74 @@ CUSTOMSTYLE_BEDGIN_NAMESPACE
 
 ExCustomStyle::ExCustomStyle()
 {
-
 }
 
+
+//重写重载的函数+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+void ExCustomStyle::drawPrimitive(QStyle::PrimitiveElement pe, const QStyleOption *opt, QPainter *p, const QWidget *w) const
+{
+    QCommonStyle::drawPrimitive(pe, opt, p, w);
+}
+
+void ExCustomStyle::drawControl(QStyle::ControlElement element, const QStyleOption *opt, QPainter *p, const QWidget *w) const
+{
+        switch (element) {
+        //滚动条+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+        case CE_ScrollBarAddPage: {  //增加页(在滑槽)
+            p->fillRect(opt->rect, Qt::green);
+            break;
+        }
+        case CE_ScrollBarSubPage: {  //减少页(在滑槽)
+            p->fillRect(opt->rect, Qt::gray);
+            break;
+        }
+        case CE_ScrollBarSlider: {  //滑块
+            p->fillRect(opt->rect, Qt::red);
+            break;
+        }
+        case CE_ScrollBarAddLine: {  //增加按钮
+            p->fillRect(opt->rect, Qt::blue);
+            break;
+        }
+        case CE_ScrollBarSubLine: {  //减少按钮
+            p->fillRect(opt->rect, Qt::magenta);
+            break;
+        }
+//        case CE_ScrollBarFirst:
+//        case CE_ScrollBarLast: break; //未知
+        //END+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+        default:
+            break;
+        }
+
+    QCommonStyle::drawControl(element, opt, p, w);
+}
+
+QRect ExCustomStyle::subElementRect(QStyle::SubElement subElement, const QStyleOption *option, const QWidget *widget) const
+{
+    return QCommonStyle::subElementRect(subElement, option, widget);
+}
+
+int ExCustomStyle::pixelMetric(QStyle::PixelMetric metric, const QStyleOption *option, const QWidget *widget) const
+{
+    return QCommonStyle::pixelMetric(metric, option, widget);
+}
+
+QSize ExCustomStyle::sizeFromContents(QStyle::ContentsType ct, const QStyleOption *opt, const QSize &contentsSize, const QWidget *w) const
+{
+    return QCommonStyle::sizeFromContents(ct, opt, contentsSize, w);
+}
+
+int ExCustomStyle::styleHint(QStyle::StyleHint stylehint, const QStyleOption *opt, const QWidget *widget, QStyleHintReturn *returnData) const
+{
+    return QCommonStyle::styleHint(stylehint, opt, widget, returnData);
+}
+
+QIcon ExCustomStyle::standardIcon(QStyle::StandardPixmap standardIcon, const QStyleOption *option, const QWidget *widget) const
+{
+    return QCommonStyle::standardIcon(standardIcon, option, widget);
+}
+
+//END+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
 CUSTOMSTYLE_END_NAMESPACE

QtCustomStyleEx/ExCustomStyle.h

@@ -1,18 +1,37 @@
 #ifndef EXCUSTOMSTYLE_H
 #define EXCUSTOMSTYLE_H
 
+//Qt自带的库
 #include <QCommonStyle>
+#include <QPainter>
+#include <QStyleOption>
 
+//自定义的文件或库
 #include "ExDefineGlobal.h"
 
 CUSTOMSTYLE_BEDGIN_NAMESPACE
 
+//一些工具函数:绘画圈,叉,对号,阴影等功能函数
+CUSTOM_BEGIN_NAMESPACE
+CUSTOMSTYLE_END_NAMESPACE
+
 class ExCustomStyle : public QCommonStyle
 {
     Q_OBJECT
 
 public:
     ExCustomStyle();
+
+public:  //重写QCommonStyle重载的函数
+    virtual void drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, QPainter *p, const QWidget *w) const override;
+    virtual void drawControl(ControlElement element, const QStyleOption *opt, QPainter *p, const QWidget *w) const override;
+    virtual QRect subElementRect(SubElement subElement, const QStyleOption *option, const QWidget *widget) const override;
+    virtual int pixelMetric(PixelMetric metric, const QStyleOption *option, const QWidget *widget) const override;
+    virtual QSize sizeFromContents(ContentsType ct, const QStyleOption *opt, const QSize &contentsSize, const QWidget *w) const override;
+    virtual int styleHint(StyleHint stylehint, const QStyleOption *opt, const QWidget *widget, QStyleHintReturn *returnData) const override;
+    virtual QIcon standardIcon(StandardPixmap standardIcon, const QStyleOption *option, const QWidget *widget) const override;
+
+public:
 };
 
 CUSTOMSTYLE_END_NAMESPACE

QtCustomStyleEx/ExDefineGlobal.h

@@ -7,7 +7,12 @@
 #define CUSTOMSTYLE_BEDGIN_NAMESPACE namespace touwoyimuliStyle {
 #define CUSTOMSTYLE_END_NAMESPACE }
 
+#define CUSTOM_BEGIN_NAMESPACE namespace touwoyimuliDrawUtils {          //嵌套于命名空间 touwoyimuliDrawUtils里面
+#define CUSTOM_END_NAMESPACE }
+
 //定义使用命名空间((在使用 class ExCustomStyle的定义内容时候用到了  eg:Examples.cpp里面))
 #define CUSTOMSTYLE_USE_NAMESPACE using namespace touwoyimuliStyle;
 
+
+
 #endif // EXDEFINEGLOBAL_H

QtCustomStyleEx/Examples.cpp

@@ -30,7 +30,8 @@ void Examples::init()
 
     //设置一个默认的风格
     ui->comboBox->addItem("ExCustomStyle");
-    qApp->setStyle(QStyleFactory::create("Fusion"));
+//    qApp->setStyle(QStyleFactory::create("Fusion"));
+    qApp->setStyle(new ExCustomStyle());
 }