82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
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#include "colorpicker.h"
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#include "ui_colorpicker.h"
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#include <QtWidgets>
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const int zoom_box_dimensions = 7;
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ColorPicker::ColorPicker(QWidget *parent) :
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QDialog(parent),
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ui(new Ui::ColorPicker)
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{
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ui->setupUi(this);
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this->scene = new QGraphicsScene;
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// listen for spacebar press to take color
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QShortcut *takeColor = new QShortcut(Qt::Key_Space, this);
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QObject::connect(takeColor, &QShortcut::activated, [this](){
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timer->stop();
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this->accept();
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});
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// need to set up a timer because there is no good way to get global mouse movement
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// outside of the application in a cross-platform way
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timer = new QTimer(this);
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connect(timer, &QTimer::timeout, [this]() {
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QPoint cursorPos = QCursor::pos();
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if (lastCursorPos != cursorPos) {
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lastCursorPos = cursorPos;
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this->hover(cursorPos.x(), cursorPos.y());
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}
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});
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timer->start(10);
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}
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ColorPicker::~ColorPicker()
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{
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delete scene;
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delete timer;
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delete ui;
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}
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void ColorPicker::hover(int mouseX, int mouseY) {
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QScreen *screen = QGuiApplication::primaryScreen();
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if (const QWindow *window = windowHandle())
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screen = window->screen();
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if (!screen)
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return;
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// 15 X 15 box with 8x magnification = 120px square)
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QRect zoomRect(mouseX - 7, mouseY - 7, 15, 15);
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QPixmap grab = screen->grabWindow(0, mouseX - 7, mouseY - 7, 15, 15);
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int pixelRatio = grab.devicePixelRatio();
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// TODO: investigate for high dpi displays why text is too high res
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grab.setDevicePixelRatio(1);
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QPixmap magnified = grab.scaled(120, 120, Qt::KeepAspectRatio);
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QPainter painter(&magnified);
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painter.setRenderHint(QPainter::Antialiasing, false);
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QRectF rect(55, 55, 9, 9);
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painter.drawRect(rect);
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painter.end();
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// TODO: bounds checking?
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this->color = grab.toImage().pixelColor(7 * pixelRatio, 7 * pixelRatio);
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int r = this->color.red();
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int g = this->color.green();
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int b = this->color.blue();
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// update the displayed color value
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QString rgb = QString("rgb(%1, %2, %3)").arg(r).arg(g).arg(b);
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QString stylesheet = QString("background-color: %1;").arg(rgb);
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this->ui->frame_centralColor->setStyleSheet(stylesheet);
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this->ui->label_RGB->setText(rgb);
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this->ui->label_HEX->setText(color.name());
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this->ui->viewport->setPixmap(magnified);
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}
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