Qt实现范围滑动条SuperSlider
.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 SuperSlider.cpp \
20 main.cpp \
21 mainwindow.cpp
22
23 HEADERS += \
24 SuperSlider.h \
25 mainwindow.h
26
27 FORMS += \
28 mainwindow.ui
29
30 # Default rules for deployment.
31 qnx: target.path = /tmp/$${TARGET}/bin
32 else: unix:!android: target.path = /opt/$${TARGET}/bin
33 !isEmpty(target.path): INSTALLS += target
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5
6 #include "SuperSlider.h"
7
8 QT_BEGIN_NAMESPACE
9 namespace Ui { class MainWindow; }
10 QT_END_NAMESPACE
11
12 class MainWindow : public QMainWindow
13 {
14 Q_OBJECT
15
16 public:
17 MainWindow(QWidget *parent = nullptr);
18 ~MainWindow();
19
20 private:
21 Ui::MainWindow *ui;
22 };
23 #endif // MAINWINDOW_H
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 MainWindow::MainWindow(QWidget *parent)
5 : QMainWindow(parent)
6 , ui(new Ui::MainWindow)
7 {
8 ui->setupUi(this);
9
10 SuperSlider *osuperslider = new SuperSlider(this);
11 osuperslider->setGeometry(100, 100, 200, 30);
12 }
13
14 MainWindow::~MainWindow()
15 {
16 delete ui;
17 }
SuperSlider.h
1 #ifndef SUPERSLIDER_H
2 #define SUPERSLIDER_H
3
4 #pragma once
5
6 #include "qslider.h"
7 #include "qlabel.h"
8
9
10 /*
11 * Super sick nasty awesome double handled slider!
12 *
13 * @author Steve
14 */
15 class SuperSliderHandle;
16
17 class SuperSlider: public QSlider
18 {
19 Q_OBJECT
20 public:
21 SuperSlider(QWidget *parent = 0);
22 SuperSliderHandle *alt_handle;
23 void mouseReleaseEvent(QMouseEvent *event);
24 int alt_value();
25 void alt_setValue(int value);
26 void Reset();
27 void alt_update();
28 signals:
29 void alt_valueChanged(int);
30 };
31
32 class SuperEventFilter : public QObject
33 {
34 public:
35 SuperEventFilter(SuperSlider *_grandParent)
36 {grandParent = _grandParent;};
37
38 protected:
39 bool eventFilter(QObject* obj, QEvent* event);
40
41 private:
42 SuperSlider *grandParent;
43 };
44
45 class SuperSliderHandle: public QLabel
46 {
47 Q_OBJECT
48 public:
49 SuperSliderHandle(SuperSlider *parent = 0);
50 void mousePressEvent(QMouseEvent *event);
51 int value();
52 int mapValue();
53 SuperSlider *parent;
54 bool handleActivated;
55 private:
56 SuperEventFilter *filter;
57 public slots:
58 void setValue(double value);
59 };
60
61 #endif // SUPERSLIDER_H
SuperSlider.cpp
1 #include "SuperSlider.h"
2
3
4 //Qt
5 #include <QMouseEvent>
6 #include "qmimedata.h"
7 #include "qdrag.h"
8 #include "qwidgetaction.h"
9 #include "qapplication.h"
10 #include "qpixmap.h"
11 #include "qcursor.h"
12 #include "qguiapplication.h"
13 #include "qdir.h"
14 #include <QProxyStyle>
15
16 class SliderProxy : public QProxyStyle
17 {
18 public:
19 int pixelMetric ( PixelMetric metric, const QStyleOption * option = 0, const QWidget * widget = 0 ) const
20 {
21 switch(metric) {
22 case PM_SliderThickness : return 25;
23 case PM_SliderLength : return 25;
24 default : return (QProxyStyle::pixelMetric(metric,option,widget));
25 }
26 }
27 };
28
29 SuperSlider::SuperSlider(QWidget *parent)
30 : QSlider(parent)
31 {
32 //styling
33 setOrientation(Qt::Horizontal);
34 setAcceptDrops(true);
35 SliderProxy *aSliderProxy = new SliderProxy();
36
37 //hard coded path to image :/ sorry
38 QString path = "d:/1.png";// QDir::fromNativeSeparators(ImagesPath("handle.png"));
39 setStyleSheet("QSlider::handle { image: url(" + path + "); }");
40 setStyle(aSliderProxy);
41
42 //setting up the alternate handle
43 alt_handle = new SuperSliderHandle(this);
44 addAction(new QWidgetAction(alt_handle));
45 alt_handle->move(this->pos().x() + this->width()- alt_handle->width(), this->pos().y() );
46
47 }
48
49 SuperSliderHandle::SuperSliderHandle(SuperSlider *_parent)
50 : QLabel(_parent)
51 {
52 parent = _parent;
53 filter = new SuperEventFilter(parent);
54
55 //styling
56 setAcceptDrops(true);
57 //hard coded path to image :/ sorry
58 QPixmap pix = QPixmap("d:/2.png");//QPixmap(ImagesPath("handle.png"));
59 pix = pix.scaled(25, 25, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
60 setPixmap(pix);
61 }
62
63 int SuperSlider::alt_value()
64 {
65 return alt_handle->value();
66 }
67
68 void SuperSlider::alt_setValue(int value)
69 {
70 alt_handle->setValue(value);
71 }
72
73 void SuperSlider::mouseReleaseEvent(QMouseEvent *mouseEvent)
74 {
75 if (mouseEvent->button() == Qt::LeftButton)
76 {
77 alt_handle->show();
78 alt_handle->handleActivated = false;
79 }
80 mouseEvent->accept();
81 }
82
83 void SuperSlider::alt_update()
84 {
85 QPoint posCursor(QCursor::pos());
86 QPoint posParent(mapToParent(mapToGlobal(pos())));
87 QPoint point(alt_handle->mapToParent(alt_handle->mapFromGlobal(QCursor::pos())).x(),alt_handle->y());
88 int horBuffer = (alt_handle->width());
89 bool lessThanMax = mapToParent(point).x() < pos().x()+ width() - horBuffer;
90 bool greaterThanMin = mapToParent(point).x() > pos().x();
91 if(lessThanMax && greaterThanMin)
92 alt_handle->move(point);
93 emit alt_valueChanged(alt_value());
94 }
95
96 void SuperSliderHandle::mousePressEvent(QMouseEvent *mouseEvent)
97 {
98 qGuiApp->installEventFilter(filter);
99 parent->clearFocus();
100 }
101
102 bool SuperEventFilter::eventFilter(QObject* obj, QEvent* event)
103 {
104 switch(event->type())
105 {
106 case QEvent::MouseButtonRelease:
107 qGuiApp->removeEventFilter(this);
108 return true;
109 break;
110 case QEvent::MouseMove:
111 grandParent->alt_update();
112 return true;
113 break;
114 default:
115 return QObject::eventFilter(obj, event);
116 }
117 return false;
118 }
119
120 void SuperSliderHandle::setValue(double value)
121 {
122 double width = parent->width(), position = pos().x();
123 double range = parent->maximum() - parent->minimum();
124 int location = (value - parent->minimum())/range;
125 location = location *width;
126 move(y(),location);
127 }
128
129 int SuperSliderHandle::value()
130 {
131 double width = parent->width(), position = pos().x();
132 double value = position/width;
133 double range = parent->maximum() - parent->minimum();
134 return parent->minimum() + (value * range);
135 }
136 void SuperSlider::Reset()
137 {
138 int horBuffer = (alt_handle->width());
139 QPoint myPos = mapToGlobal(pos());
140 QPoint point(myPos.x() + width() - horBuffer, myPos.y()- alt_handle->height());
141 point = alt_handle->mapFromParent(point);
142
143 alt_handle->move(point);
144 alt_handle->show();
145 alt_handle->raise();
146
147 }
