Qt編寫自定義控件35-GIF錄屏控件

時間 2019-11-17

標籤編寫自定義控件 gif 欄目 HTML 简体版

原文原文鏈接

1、前言

在平時的寫做過程當中，常常須要將一些操做動做和效果圖截圖成gif格式，使得涵蓋的信息更全面更生動，有時候能夠將整個操做過程和運行效果錄製成MP4，可是文件體積比較大，並且不少網站不便於上傳，基本上都支持gif動圖，通常一個5秒左右的gif，800*600分辨率，能夠很好的控制在500KB內，這樣就比較完美的支持各大網站上傳動圖。最開始使用的是ScreenGif.exe，用了好久，感受還能夠，後面一個朋友推薦用LICEcap.exe，體積更小，壓縮比更高，再到後來發現有個gif.h開源的類，調用其中的方法能夠實現將多張圖片合併到一張gif中去，並且仍是跨平臺的，本人親自在WIN+UBUNTU測試成功。最初的代碼是倪大俠給的，我在此基礎上從新完善了下，使得能夠直接拖動窗體大小來改變錄屏區域的大小。增長了對Qt4和其餘編譯器的支持。linux

2、實現的功能

1:可設置要錄製屏幕的寬高,支持右下角直接拉動改變.
2:可設置變寬的寬度
3:可設置錄屏控件的背景顏色
4:可設置錄製的幀數
5:錄製區域可自由拖動選擇

3、效果圖

4、頭文件代碼

#ifndef GIFWIDGET_H
#define GIFWIDGET_H

/**
 * GIF錄屏控件 做者:feiyangqingyun(QQ:517216493) 2019-4-3
 * 1:可設置要錄製屏幕的寬高,支持右下角直接拉動改變.
 * 2:可設置變寬的寬度
 * 3:可設置錄屏控件的背景顏色
 * 4:可設置錄製的幀數
 * 5:錄製區域可自由拖動選擇
 */

#include <QDialog>
#include "gif.h"

class QLineEdit;
class QLabel;

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT GifWidget : public QDialog
#else
class GifWidget : public QDialog
#endif

{
    Q_OBJECT
    Q_PROPERTY(int borderWidth READ getBorderWidth WRITE setBorderWidth)
    Q_PROPERTY(QColor bgColor READ getBgColor WRITE setBgColor)

public:
    static GifWidget *Instance();
    explicit GifWidget(QWidget *parent = 0);

protected:
    bool eventFilter(QObject *watched, QEvent *event);
    void resizeEvent(QResizeEvent *);
    void paintEvent(QPaintEvent *);

private:
    static QScopedPointer<GifWidget> self;
    QWidget *widgetTop;         //標題欄
    QWidget *widgetMain;        //中間部分
    QWidget *widgetBottom;      //底部欄
    QLineEdit *txtFps;          //幀率輸入框
    QLineEdit *txtWidth;        //寬度輸入框
    QLineEdit *txtHeight;       //高度輸入框
    QPushButton *btnStart;      //開始按鈕
    QLabel *labStatus;          //顯示狀態信息

    int fps;                    //幀數 100爲1s
    int borderWidth;            //邊框寬度
    QColor bgColor;             //背景顏色

    int count;                  //幀數計數
    QString fileName;           //保存文件名稱
    QRect rectGif;              //截屏區域
    QTimer *timer;              //截屏定時器

    Gif gif;                    //gif類對象
    Gif::GifWriter *gifWriter;  //gif寫入對象

public:
    int getBorderWidth()        const;
    QColor getBgColor()         const;

private slots:
    void initControl();
    void initForm();
    void saveImage();
    void record();
    void closeAll();
    void resizeForm();

public Q_SLOTS:
    void setBorderWidth(int borderWidth);
    void setBgColor(const QColor &bgColor);
};

#endif // GIFWIDGET_H

5、核心代碼

#pragma execution_character_set("utf-8")

#include "gifwidget.h"
#include "qmutex.h"
#include "qlabel.h"
#include "qlineedit.h"
#include "qpushbutton.h"
#include "qlayout.h"
#include "qpainter.h"
#include "qevent.h"
#include "qstyle.h"
#include "qpixmap.h"
#include "qtimer.h"
#include "qdatetime.h"
#include "qapplication.h"
#include "qdesktopwidget.h"
#include "qdesktopservices.h"
#include "qfiledialog.h"
#include "qurl.h"
#include "qdebug.h"
#if (QT_VERSION > QT_VERSION_CHECK(5,0,0))
#include "qscreen.h"
#endif

QScopedPointer<GifWidget> GifWidget::self;
GifWidget *GifWidget::Instance()
{
    if (self.isNull()) {
        static QMutex mutex;
        QMutexLocker locker(&mutex);
        if (self.isNull()) {
            self.reset(new GifWidget);
        }
    }

    return self.data();
}

GifWidget::GifWidget(QWidget *parent) : QDialog(parent)
{
    this->initControl();
    this->initForm();
}

bool GifWidget::eventFilter(QObject *watched, QEvent *event)
{
    static QPoint mousePoint;
    static bool mousePressed = false;

    QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
    if (mouseEvent->type() == QEvent::MouseButtonPress) {
        if (mouseEvent->button() == Qt::LeftButton) {
            mousePressed = true;
            mousePoint = mouseEvent->globalPos() - this->pos();
            return true;
        }
    } else if (mouseEvent->type() == QEvent::MouseButtonRelease) {
        mousePressed = false;
        return true;
    } else if (mouseEvent->type() == QEvent::MouseMove) {
        if (mousePressed && (mouseEvent->buttons() && Qt::LeftButton)) {
            this->move(mouseEvent->globalPos() - mousePoint);
            return true;
        }
    }

    return QWidget::eventFilter(watched, event);
}

void GifWidget::resizeEvent(QResizeEvent *e)
{
    //拉動右下角改變大小自動賦值
    txtWidth->setText(QString::number(widgetMain->width()));
    txtHeight->setText(QString::number(widgetMain->height()));
    QDialog::resizeEvent(e);
}

void GifWidget::paintEvent(QPaintEvent *)
{
    int width = txtWidth->text().toInt();
    int height = txtHeight->text().toInt();
    rectGif = QRect(borderWidth, widgetTop->height(), width - (borderWidth * 2), height);

    QPainter painter(this);
    painter.setPen(Qt::NoPen);
    painter.setBrush(bgColor);
    painter.drawRoundedRect(this->rect(), 5, 5);
    painter.setCompositionMode(QPainter::CompositionMode_Clear);
    painter.fillRect(rectGif, Qt::SolidPattern);
}

int GifWidget::getBorderWidth() const
{
    return this->borderWidth;
}

QColor GifWidget::getBgColor() const
{
    return this->bgColor;
}

void GifWidget::initControl()
{
    this->setObjectName("GifWidget");
    this->resize(800, 600);
    this->setSizeGripEnabled(true);
    QVBoxLayout *verticalLayout = new QVBoxLayout(this);
    verticalLayout->setSpacing(0);
    verticalLayout->setContentsMargins(11, 11, 11, 11);
    verticalLayout->setObjectName("verticalLayout");
    verticalLayout->setContentsMargins(0, 0, 0, 0);

    widgetTop = new QWidget(this);
    widgetTop->setObjectName("widgetTop");
    widgetTop->setMinimumSize(QSize(0, 35));
    widgetTop->setMaximumSize(QSize(16777215, 35));

    QHBoxLayout *layoutTop = new QHBoxLayout(widgetTop);
    layoutTop->setSpacing(0);
    layoutTop->setContentsMargins(11, 11, 11, 11);
    layoutTop->setObjectName("layoutTop");
    layoutTop->setContentsMargins(0, 0, 0, 0);

    QPushButton *btnIcon = new QPushButton(widgetTop);
    btnIcon->setObjectName("btnIcon");
    QSizePolicy sizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
    sizePolicy.setHorizontalStretch(0);
    sizePolicy.setVerticalStretch(0);
    sizePolicy.setHeightForWidth(btnIcon->sizePolicy().hasHeightForWidth());
    btnIcon->setSizePolicy(sizePolicy);
    btnIcon->setMinimumSize(QSize(35, 0));
    btnIcon->setFlat(true);
    layoutTop->addWidget(btnIcon);

    QLabel *labTitle = new QLabel(widgetTop);
    labTitle->setObjectName("labTitle");
    layoutTop->addWidget(labTitle);

    QSpacerItem *horizontalSpacer = new QSpacerItem(87, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
    layoutTop->addItem(horizontalSpacer);

    QPushButton *btnClose = new QPushButton(widgetTop);
    btnClose->setObjectName("btnClose");
    sizePolicy.setHeightForWidth(btnClose->sizePolicy().hasHeightForWidth());
    btnClose->setSizePolicy(sizePolicy);
    btnClose->setMinimumSize(QSize(35, 0));
    btnClose->setFocusPolicy(Qt::NoFocus);
    btnClose->setFlat(true);
    layoutTop->addWidget(btnClose);
    verticalLayout->addWidget(widgetTop);

    widgetMain = new QWidget(this);
    widgetMain->setObjectName("widgetMain");
    QSizePolicy sizePolicy1(QSizePolicy::Preferred, QSizePolicy::Expanding);
    sizePolicy1.setHorizontalStretch(0);
    sizePolicy1.setVerticalStretch(0);
    sizePolicy1.setHeightForWidth(widgetMain->sizePolicy().hasHeightForWidth());
    widgetMain->setSizePolicy(sizePolicy1);
    verticalLayout->addWidget(widgetMain);

    widgetBottom = new QWidget(this);
    widgetBottom->setObjectName("widgetBottom");
    widgetBottom->setMinimumSize(QSize(0, 45));
    widgetBottom->setMaximumSize(QSize(16777215, 45));

    QHBoxLayout *layoutBottom = new QHBoxLayout(widgetBottom);
    layoutBottom->setSpacing(6);
    layoutBottom->setContentsMargins(11, 11, 11, 11);
    layoutBottom->setObjectName("layoutBottom");
    layoutBottom->setContentsMargins(9, 9, -1, -1);

    QLabel *labFps = new QLabel(widgetBottom);
    labFps->setObjectName("labFps");
    layoutBottom->addWidget(labFps);

    txtFps = new QLineEdit(widgetBottom);
    txtFps->setObjectName("txtFps");
    txtFps->setMaximumSize(QSize(50, 16777215));
    txtFps->setAlignment(Qt::AlignCenter);
    layoutBottom->addWidget(txtFps);

    QLabel *labWidth = new QLabel(widgetBottom);
    labWidth->setObjectName("labWidth");
    layoutBottom->addWidget(labWidth);

    txtWidth = new QLineEdit(widgetBottom);
    txtWidth->setObjectName("txtWidth");
    txtWidth->setEnabled(true);
    txtWidth->setMaximumSize(QSize(50, 16777215));
    txtWidth->setAlignment(Qt::AlignCenter);
    layoutBottom->addWidget(txtWidth);

    QLabel *labHeight = new QLabel(widgetBottom);
    labHeight->setObjectName("labHeight");
    layoutBottom->addWidget(labHeight);

    txtHeight = new QLineEdit(widgetBottom);
    txtHeight->setObjectName("txtHeight");
    txtHeight->setEnabled(true);
    txtHeight->setMaximumSize(QSize(50, 16777215));
    txtHeight->setAlignment(Qt::AlignCenter);
    layoutBottom->addWidget(txtHeight);

    labStatus = new QLabel(widgetBottom);
    labStatus->setObjectName("labStatus");
    QSizePolicy sizePolicy2(QSizePolicy::Expanding, QSizePolicy::Preferred);
    sizePolicy2.setHorizontalStretch(0);
    sizePolicy2.setVerticalStretch(0);
    sizePolicy2.setHeightForWidth(labStatus->sizePolicy().hasHeightForWidth());
    labStatus->setSizePolicy(sizePolicy2);
    labStatus->setAlignment(Qt::AlignCenter);
    layoutBottom->addWidget(labStatus);

    btnStart = new QPushButton(widgetBottom);
    btnStart->setObjectName("btnStart");
    sizePolicy.setHeightForWidth(btnStart->sizePolicy().hasHeightForWidth());
    btnStart->setSizePolicy(sizePolicy);
    layoutBottom->addWidget(btnStart);
    verticalLayout->addWidget(widgetBottom);

    labTitle->setText("GIF錄屏工具(QQ:517216493)");
    labFps->setText("幀率");
    labWidth->setText("寬度");
    labHeight->setText("高度");
    btnStart->setText("開始");
    this->setWindowTitle(labTitle->text());

    btnIcon->setIcon(style()->standardIcon(QStyle::SP_ComputerIcon));
    btnClose->setIcon(style()->standardIcon(QStyle::SP_TitleBarCloseButton));

    connect(btnClose, SIGNAL(clicked(bool)), this, SLOT(closeAll()));
    connect(btnStart, SIGNAL(clicked(bool)), this, SLOT(record()));
    connect(txtWidth, SIGNAL(editingFinished()), this, SLOT(resizeForm()));
    connect(txtHeight, SIGNAL(editingFinished()), this, SLOT(resizeForm()));
}

void GifWidget::initForm()
{
    borderWidth = 3;
    bgColor = QColor(34, 163, 169);

    fps = 10;
    txtFps->setText(QString::number(fps));
    gifWriter = 0;

    timer = new QTimer(this);
    timer->setInterval(100);
    connect(timer, SIGNAL(timeout()), this, SLOT(saveImage()));

    this->setAttribute(Qt::WA_TranslucentBackground);
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowSystemMenuHint | Qt::WindowMinMaxButtonsHint | Qt::WindowStaysOnTopHint);
    this->installEventFilter(this);

    QStringList qss;
    qss.append("QLabel{color:#ffffff;}");
    qss.append("#btnClose,#btnIcon{border:none;border-radius:0px;}");
    qss.append("#btnClose:hover{background-color:#ff0000;}");
    qss.append("#btnClose{border-top-right-radius:5px;}");
    qss.append("#labTitle{font:bold 16px;}");
    qss.append("#labStatus{font:15px;}");
    this->setStyleSheet(qss.join(""));
}

void GifWidget::saveImage()
{
    if (!gifWriter) {
        return;
    }

#if (QT_VERSION <= QT_VERSION_CHECK(5,0,0))
    //因爲qt4沒有RGBA8888,採用最接近RGBA8888的是ARGB32,顏色會有點誤差
    QPixmap pix = QPixmap::grabWindow(0, x() + rectGif.x(), y() + rectGif.y(), rectGif.width(), rectGif.height());
    QImage image = pix.toImage().convertToFormat(QImage::Format_ARGB32);
#else
    QScreen *screen = QApplication::primaryScreen();
    QPixmap pix = screen->grabWindow(0, x() + rectGif.x(), y() + rectGif.y(), rectGif.width(), rectGif.height());
    QImage image = pix.toImage().convertToFormat(QImage::Format_RGBA8888);
#endif

    gif.GifWriteFrame(gifWriter, image.bits(), rectGif.width(), rectGif.height(), fps);
    count++;
    labStatus->setText(QString("正在錄製 第 %1 幀").arg(count));
}

void GifWidget::record()
{
    if (btnStart->text() == "開始") {
        if (0 != gifWriter) {
            delete gifWriter;
            gifWriter = 0;
        }

        //先彈出文件保存對話框
        //fileName = qApp->applicationDirPath() + "/" + QDateTime::currentDateTime().toString("yyyy-MM-dd-hh-mm-ss.gif");
        fileName = QFileDialog::getSaveFileName(this, "選擇保存位置", qApp->applicationDirPath() + "/", "gif圖片(*.gif)");
        if (fileName.isEmpty()) {
            return;
        }

        int width = txtWidth->text().toInt();
        int height = txtHeight->text().toInt();
        fps = txtFps->text().toInt();

        gifWriter = new Gif::GifWriter;
        bool bOk = gif.GifBegin(gifWriter, fileName.toLocal8Bit().data(), width, height, fps);
        if (!bOk) {
            delete gifWriter;
            gifWriter = 0;
            return;
        }

        count = 0;
        labStatus->setText("開始錄製...");
        btnStart->setText("中止");
        //延時啓動
        timer->setInterval(1000 / fps);
        QTimer::singleShot(1000, timer, SLOT(start()));
        //saveImage();
    } else {
        timer->stop();
        gif.GifEnd(gifWriter);

        delete gifWriter;
        gifWriter = 0;

        labStatus->setText(QString("錄製完成 共 %1 幀").arg(count));
        btnStart->setText("開始");
        QDesktopServices::openUrl(QUrl(fileName));
    }
}

void GifWidget::closeAll()
{
    if (0 != gifWriter) {
        delete gifWriter;
        gifWriter = 0;
    }

    this->close();
}

void GifWidget::resizeForm()
{
    int width = txtWidth->text().toInt();
    int height = txtHeight->text().toInt();
    this->resize(width, height + widgetTop->height() + widgetBottom->height());
}

void GifWidget::setBorderWidth(int borderWidth)
{
    if (this->borderWidth != borderWidth) {
        this->borderWidth = borderWidth;
        this->update();
    }
}

void GifWidget::setBgColor(const QColor &bgColor)
{
    if (this->bgColor != bgColor) {
        this->bgColor = bgColor;
        this->update();
    }
}

6、控件介紹

超過149個精美控件，涵蓋了各類儀表盤、進度條、進度球、指南針、曲線圖、標尺、溫度計、導航條、導航欄，flatui、高亮按鈕、滑動選擇器、農曆等。遠超qwt集成的控件數量。
每一個類均可以獨立成一個單獨的控件，零耦合，每一個控件一個頭文件和一個實現文件，不依賴其餘文件，方便單個控件以源碼形式集成到項目中，較少代碼量。qwt的控件類環環相扣，高度耦合，想要使用其中一個控件，必須包含全部的代碼。
所有純Qt編寫，QWidget+QPainter繪製，支持Qt4.6到Qt5.12的任何Qt版本，支持mingw、msvc、gcc等編譯器，支持任意操做系統好比windows+linux+mac+嵌入式linux等，不亂碼，可直接集成到Qt Creator中，和自帶的控件同樣使用，大部分效果只要設置幾個屬性便可，極爲方便。
每一個控件都有一個對應的單獨的包含該控件源碼的DEMO，方便參考使用。同時還提供一個全部控件使用的集成的DEMO。
每一個控件的源代碼都有詳細中文註釋，都按照統一設計規範編寫，方便學習自定義控件的編寫。
每一個控件默認配色和demo對應的配色都很是精美。
超過130個可見控件，6個不可見控件。
部分控件提供多種樣式風格選擇，多種指示器樣式選擇。
全部控件自適應窗體拉伸變化。
集成自定義控件屬性設計器，支持拖曳設計，所見即所得，支持導入導出xml格式。
自帶activex控件demo，全部控件能夠直接運行在ie瀏覽器中。
集成fontawesome圖形字體+阿里巴巴iconfont收藏的幾百個圖形字體，享受圖形字體帶來的樂趣。
全部控件最後生成一個dll動態庫文件，能夠直接集成到qtcreator中拖曳設計使用。
目前已經有qml版本，後期會考慮出pyqt版本，若是用戶需求量很大的話。