mainwindow.cpp

QWT5.01用于Qt开发的二维图形库程序

#include <qlabel.h>
#include <qlayout.h>
#include <qstatusbar.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <qspinbox.h>
#include <qwhatsthis.h>
#include <qpixmap.h>
#include "randomplot.h"
#include "mainwindow.h"
#include "start.xpm"
#include "clear.xpm"

class MyToolBar: public QToolBar
{
public:
    MyToolBar(MainWindow *parent):
        QToolBar(parent)
    {
    }
    void addSpacing(int spacing)
    {
        QLabel *label = new QLabel(this);
#if QT_VERSION >= 0x040000
        addWidget(label);
#endif
        label->setFixedWidth(spacing);
    }    
};

class Counter: public QWidget
{
public:
    Counter(QWidget *parent, 
            const QString &prefix, const QString &suffix,
            int min, int max, int step):
        QWidget(parent)
    {
        QHBoxLayout *layout = new QHBoxLayout(this);

        if ( !prefix.isEmpty() )
            layout->addWidget(new QLabel(prefix + " ", this));

#if QT_VERSION < 0x040000
        d_counter = new QSpinBox(min, max, step, this);
#else
        d_counter = new QSpinBox(this);
        d_counter->setRange(min, max);
        d_counter->setSingleStep(step);
#endif
        layout->addWidget(d_counter);

        if ( !suffix.isEmpty() )
            layout->addWidget(new QLabel(QString(" ") + suffix, this));
    }

    void setValue(int value) { d_counter->setValue(value); }
    int value() const { return d_counter->value(); }

private:
    QSpinBox *d_counter;
};

MainWindow::MainWindow()
{
#if QT_VERSION < 0x040000
    setDockEnabled(TornOff, true);
    setRightJustification(true);
#endif

    addToolBar(toolBar());
#ifndef QT_NO_STATUSBAR
    (void)statusBar();
#endif

    d_plot = new RandomPlot(this);
    d_plot->setMargin(4);

    setCentralWidget(d_plot);

#if QT_VERSION >= 0x040000
    connect(d_startAction, SIGNAL(toggled(bool)), this, SLOT(appendPoints(bool)));
    connect(d_clearAction, SIGNAL(triggered()), d_plot, SLOT(clear()));
#else
    connect(d_startBtn, SIGNAL(toggled(bool)), this, SLOT(appendPoints(bool)));
    connect(d_clearBtn, SIGNAL(clicked()), d_plot, SLOT(clear()));
#endif
    connect(d_plot, SIGNAL(running(bool)), this, SLOT(showRunning(bool)));

    initWhatsThis();

#if QT_VERSION >= 0x040000
    setContextMenuPolicy(Qt::NoContextMenu);
#endif
}

QToolBar *MainWindow::toolBar()
{
    MyToolBar *toolBar = new MyToolBar(this);

#if QT_VERSION >= 0x040000
    toolBar->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
    setToolButtonStyle(Qt::ToolButtonTextUnderIcon);

    d_startAction = new QAction(QIcon(start_xpm), "Clear", toolBar);
    d_startAction->setCheckable(true);
    d_clearAction = new QAction(QIcon(clear_xpm), "Clear", toolBar);
    QAction *whatsThisAction = QWhatsThis::createAction(toolBar);
    whatsThisAction->setText("Help");

    toolBar->addAction(d_startAction);
    toolBar->addAction(d_clearAction);
    toolBar->addAction(whatsThisAction);

    setIconSize(QSize(22, 22));
#else
    d_startBtn = new QToolButton(toolBar);
    d_startBtn->setUsesTextLabel(true);
    d_startBtn->setPixmap(QPixmap(start_xpm));
    d_startBtn->setToggleButton(true);

    d_clearBtn = new QToolButton(toolBar);
    d_clearBtn->setUsesTextLabel(true);
    d_clearBtn->setPixmap(QPixmap(clear_xpm));
    d_clearBtn->setTextLabel("Clear", false);

    QToolButton *helpBtn = QWhatsThis::whatsThisButton(toolBar);
    helpBtn->setUsesTextLabel(true);
    helpBtn->setTextLabel("Help", false);
#endif

    QWidget *hBox = new QWidget(toolBar);

    d_randomCount = 
        new Counter(hBox, "Points", QString::null, 1, 100000, 100);
    d_randomCount->setValue(1000);

    d_timerCount = new Counter(hBox, "Delay", "ms", 0, 100000, 100);
    d_timerCount->setValue(0);

    QHBoxLayout *layout = new QHBoxLayout(hBox);
    layout->setMargin(0);
    layout->setSpacing(0);
    layout->addSpacing(10);
    layout->addWidget(new QWidget(hBox), 10); // spacer
    layout->addWidget(d_randomCount);
    layout->addSpacing(5);
    layout->addWidget(d_timerCount);

    showRunning(false);

#if QT_VERSION < 0x040000
    toolBar->setStretchableWidget(hBox);

    d_startBtn->setMinimumWidth(helpBtn->sizeHint().width() + 20);
    d_clearBtn->setMinimumWidth(helpBtn->sizeHint().width() + 20);
    helpBtn->setMinimumWidth(helpBtn->sizeHint().width() + 20);
#else
    toolBar->addWidget(hBox);
#endif

    return toolBar;
}

void MainWindow::appendPoints(bool on)
{
    if ( on )
        d_plot->append(d_timerCount->value(),
            d_randomCount->value());
    else
        d_plot->stop();
}

void MainWindow::showRunning(bool running)
{
    d_randomCount->setEnabled(!running);
    d_timerCount->setEnabled(!running);
#if QT_VERSION < 0x040000
    d_startBtn->setOn(running);
    d_startBtn->setTextLabel(running ? "Stop" : "Start", false);
#else
    d_startAction->setChecked(running);
    d_startAction->setText(running ? "Stop" : "Start");
#endif
}

void MainWindow::initWhatsThis()
{
    const char *text1 =
        "Zooming is enabled until the selected area gets "
        "too small for the significance on the axes.\n\n"
        "You can zoom in using the left mouse button.\n"
        "The middle mouse button is used to go back to the "
        "previous zoomed area.\n"
        "The right mouse button is used to unzoom completely.";

    const char *text2 =
        "Number of random points that will be generated.";

    const char *text3 =
        "Delay between the generation of two random points.";

    const char *text4 =
        "Start generation of random points.\n\n"
        "The intention of this example is to show how to implement "
        "growing curves. The points will be generated and displayed "
        "one after the other.\n"
        "To check the performance, a small delay and a large number "
        "of points are useful. To watch the curve growing, a delay "
        " > 300 ms and less points are better.\n"
        "To inspect the curve, stacked zooming is implemented using the "
        "mouse buttons on the plot.";

    const char *text5 = "Remove all points.";

#if QT_VERSION < 0x040000
    QWhatsThis::add(d_plot, text1);
    QWhatsThis::add(d_randomCount, text2);
    QWhatsThis::add(d_timerCount, text3);
    QWhatsThis::add(d_startBtn, text4);
    QWhatsThis::add(d_clearBtn, text5);
#else
    d_plot->setWhatsThis(text1);
    d_randomCount->setWhatsThis(text2);
    d_timerCount->setWhatsThis(text3);
    d_startAction->setWhatsThis(text4);
    d_clearAction->setWhatsThis(text5);
#endif
}