? ? ? ? 遇到一個好看的背景顏色，想知道它的RGB值，這時就需要屏幕顏色拾取器了。如下，用鼠標左鍵點中+字，拖曳到要拾取的顏色位置，松開左鍵就得該位置的RGB值了。

? ? ? ? 該工程的Qt源碼和exe工具鏈接
? ? ? ? 使用Qt5.4.1編寫屏幕拾取器的代碼如下：
//1) 頭文件 myColor.h

#pragma once#include <QtWidgets/QWidget> #include "ui_myColor.h"class QGridLayout; class QVBoxLayout; class QLabel; class QLineEdit;#if (QT_VERSION < QT_VERSION_CHECK(5,7,0)) #include <QtDesigner/QDesignerExportWidget> #else #include <QtUiPlugin/QDesignerExportWidget> #endifclass myColor : public QWidget {Q_OBJECTpublic:static myColor *Instance();myColor(QWidget *parent = Q_NULLPTR);protected:void mousePressEvent(QMouseEvent *);void mouseReleaseEvent(QMouseEvent *);private:static myColor *instance;QClipboard *cp;bool pressed;QTimer *timer;QGridLayout *gridLayout;QVBoxLayout *verticalLayout;QLabel *labColor;QLabel *label;QLabel *labWeb;QLineEdit *txtWeb;QLabel *labRgb;QLineEdit *txtRgb;QLabel *labPoint;QLineEdit *txtPoint;private Q_SLOTS:void showColorValue();private:Ui::myColorClass ui; };

//2) 源文件 myColor.cpp

#pragma execution_character_set("utf-8")#include "myColor.h" #include <QBasicMutex> #include <QGridLayout> #include <QLabel> #include <QLineEdit> #include <QApplication> #include <QMouseEvent> #include <QTimer> #include <QEvent> #include <QDebug> #include <QScreen> #include <qdesktopwidget.h>myColor *myColor::instance = 0; myColor *myColor::Instance() {if (!instance){static QMutex mutex;QMutexLocker locker(&mutex);if (!instance){instance = new myColor;}}return instance; }myColor::myColor(QWidget *parent): QWidget(parent) {gridLayout = new QGridLayout(this);gridLayout->setSpacing(6);gridLayout->setContentsMargins(11, 11, 11, 11);verticalLayout = new QVBoxLayout();verticalLayout->setSpacing(0);labColor = new QLabel(this);labColor->setText("+");labColor->setStyleSheet("background-color: rgb(255, 107, 107);color: rgb(250, 250, 250);");labColor->setAlignment(Qt::AlignCenter);QFont font;font.setPixelSize(35);font.setBold(true);labColor->setFont(font);QSizePolicy sizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);sizePolicy.setHorizontalStretch(0);sizePolicy.setVerticalStretch(0);sizePolicy.setHeightForWidth(labColor->sizePolicy().hasHeightForWidth());labColor->setSizePolicy(sizePolicy);labColor->setMinimumSize(QSize(80, 70));labColor->setMaximumSize(QSize(80, 70));labColor->setCursor(QCursor(Qt::CrossCursor));labColor->setFrameShape(QFrame::StyledPanel);labColor->setFrameShadow(QFrame::Sunken);verticalLayout->addWidget(labColor);label = new QLabel(this);label->setMinimumSize(QSize(0, 18));label->setStyleSheet("background-color: rgb(0, 0, 0);color: rgb(200, 200, 200);");label->setAlignment(Qt::AlignCenter);verticalLayout->addWidget(label);gridLayout->addLayout(verticalLayout, 0, 0, 3, 1);labWeb = new QLabel(this);gridLayout->addWidget(labWeb, 0, 1, 1, 1);txtWeb = new QLineEdit(this);gridLayout->addWidget(txtWeb, 0, 2, 1, 1);labRgb = new QLabel(this);gridLayout->addWidget(labRgb, 1, 1, 1, 1);txtRgb = new QLineEdit(this);gridLayout->addWidget(txtRgb, 1, 2, 1, 1);labPoint = new QLabel(this);gridLayout->addWidget(labPoint, 2, 1, 1, 1);txtPoint = new QLineEdit(this);gridLayout->addWidget(txtPoint, 2, 2, 1, 1);label->setText("當前顏色顯示");labWeb->setText("web值:");labRgb->setText("rgb值:");labPoint->setText("坐標值:");this->setLayout(gridLayout);this->setWindowTitle("屏幕拾色器");this->setFixedSize(270, 108);cp = QApplication::clipboard();pressed = false;timer = new QTimer(this);timer->setInterval(100);connect(timer, SIGNAL(timeout()), this, SLOT(showColorValue()));timer->start();ui.setupUi(this); }void myColor::mousePressEvent(QMouseEvent *e) {if (labColor->rect().contains(e->pos())){pressed = true;} }void myColor::mouseReleaseEvent(QMouseEvent *e) {pressed = false; }void myColor::showColorValue() {if (!pressed){return;}int x = QCursor::pos().x();int y = QCursor::pos().y();txtPoint->setText(tr("x:%1 y:%2").arg(x).arg(y));QString strDecimalValue, strHex, strTextColor;int red, green, blue;#if (QT_VERSION <= QT_VERSION_CHECK(5,0,0))QPixmap pixmap = QPixmap::grabWindow(QApplication::desktop()->winId(), x, y, 2, 2); #elseQScreen *screen = QApplication::primaryScreen();QPixmap pixmap = screen->grabWindow(QApplication::desktop()->winId(), x, y, 2, 2); #endifif (!pixmap.isNull()) {QImage image = pixmap.toImage();if (!image.isNull()) {if (image.valid(0, 0)) {QColor color = image.pixel(0, 0);red = color.red();green = color.green();blue = color.blue();QString strRed = tr("%1").arg(red & 0xFF, 2, 16, QChar('0'));QString strGreen = tr("%1").arg(green & 0xFF, 2, 16, QChar('0'));QString strBlue = tr("%1").arg(blue & 0xFF, 2, 16, QChar('0'));strDecimalValue = tr("%1, %2, %3").arg(red).arg(green).arg(blue);strHex = tr("#%1%2%3").arg(strRed.toUpper()).arg(strGreen.toUpper()).arg(strBlue.toUpper());}}}if (red > 200 && green > 200 && blue > 200) {strTextColor = "10, 10, 10";}else {strTextColor = "255, 255, 255";}QString str = tr("background-color: rgb(%1);color: rgb(%2)").arg(strDecimalValue).arg(strTextColor);labColor->setStyleSheet(str);txtRgb->setText(strDecimalValue);txtWeb->setText(strHex);}

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