c++ - 如何将 QWinThumbnailToolBar 与 QMainWindow 一起使用

Question

我想在 Qt 5.2 中尝试 QWinThumbnailToolBar 但它不起作用!(程序运行但没有缩略图 !!!!)

//main.cpp
#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}


//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWinThumbnailToolButton>
#include <QWinThumbnailToolBar>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QWinThumbnailToolBar* thumbnailToolBar;
    QWinThumbnailToolButton *playToolButton;
    QWinThumbnailToolButton *forwardToolButton;
    QWinThumbnailToolButton *backwardToolButton;
};

#endif // MAINWINDOW_H


//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    thumbnailToolBar = new QWinThumbnailToolBar(this);
    thumbnailToolBar->setWindow(this->windowHandle());

    playToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    playToolButton->setEnabled(false);
    playToolButton->setToolTip(tr("true"));
    playToolButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    forwardToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    forwardToolButton->setEnabled(true);
    forwardToolButton->setToolTip(tr("Fast forward"));
    forwardToolButton->setIcon(style()->standardIcon(QStyle::SP_TrashIcon));

    backwardToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    backwardToolButton->setEnabled(true);
    backwardToolButton->setToolTip(tr("Rewind"));
    backwardToolButton->setIcon(style()->standardIcon(QStyle::SP_MediaSeekBackward));

    thumbnailToolBar->addButton(backwardToolButton);
    thumbnailToolBar->addButton(playToolButton);
    thumbnailToolBar->addButton(forwardToolButton);
}

MainWindow::~MainWindow()
{
    delete ui;
}

//pro file :

QT       += core gui winextras multimedia

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = untitled1
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

我认为问题出在这两行:

 thumbnailToolBar = new QWinThumbnailToolBar(this);
 thumbnailToolBar->setWindow(this->windowHandle());

我还尝试使用 QWidget 而不是 QMainWindow...我该如何修复它？？

Answer 1

您创建 QWinThumbnailToolBar 的代码是正确的，问题在于您在哪里创建它。我认为在窗口构造函数中创建它是问题所在(可能是因为窗口句柄尚未准备好)。你可以做这样的事情:

// main.cpp

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    FrmMain w;
    w.show();
    w.createThmbBar();

    return a.exec();
}

其中 createThumbBar() 是一个公共(public)函数，您可以在其中创建 QWinThumbnailToolBar，如下所示:

//主窗口.cpp

void MainWindow::createThmbBar()
{
    thumbnailToolBar = new QWinThumbnailToolBar(this);
    thumbnailToolBar->setWindow(this->windowHandle());

    playToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    playToolButton->setEnabled(false);
    playToolButton->setToolTip(tr("true"));
    playToolButton->setIcon(style()->standardIcon(QStyle::SP_MediaPlay));

    forwardToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    forwardToolButton->setEnabled(true);
    forwardToolButton->setToolTip(tr("Fast forward"));
    forwardToolButton->setIcon(style()->standardIcon(QStyle::SP_TrashIcon));

    backwardToolButton = new QWinThumbnailToolButton(thumbnailToolBar);
    backwardToolButton->setEnabled(true);
    backwardToolButton->setToolTip(tr("Rewind"));
    backwardToolButton->setIcon(style()->standardIcon(QStyle::SP_MediaSeekBackward));

    thumbnailToolBar->addButton(backwardToolButton);
    thumbnailToolBar->addButton(playToolButton);
    thumbnailToolBar->addButton(forwardToolButton);
}

迟到的答案，但希望它可以帮助任何人以后遇到同样的问题。