雷电芽衣andClaude
c864304695
A layered image editor for Linux and Omarchy, ported from Compositor (github.com/robbietilton/Compositor), whose Swift source is its specification. It reads and writes Compositor's .comp projects. Packages for Ubuntu, Fedora and Arch come from the release workflow; scripts/install/ holds one install script per distribution family, and flake.nix serves NixOS. Co-Authored-By: Claude <noreply@anthropic.com>
74 lines
3.3 KiB
C++
74 lines
3.3 KiB
C++
#include "UI/SliderSnap.h"
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#include <QApplication>
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#include <QMouseEvent>
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#include <QSlider>
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#include <QStyle>
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#include <QStyleOptionSlider>
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#include <algorithm>
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namespace {
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// Swift's snapValue: the value under a press on the track.
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class Snap : public QObject {
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public:
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using QObject::QObject;
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protected:
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bool eventFilter(QObject *watched, QEvent *event) override
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{
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auto *slider = qobject_cast<QSlider *>(watched);
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if (!slider || event->type() != QEvent::MouseButtonPress)
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return false;
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const auto *press = static_cast<QMouseEvent *>(event);
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// Qt refuses a press made with another button held.
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if (press->buttons() != Qt::LeftButton || slider->orientation() != Qt::Horizontal || !slider->isEnabled()
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|| slider->maximum() <= slider->minimum())
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return false;
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// QSlider's own style option, which it keeps protected.
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QStyleOptionSlider option;
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option.initFrom(slider);
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option.orientation = Qt::Horizontal;
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option.state |= QStyle::State_Horizontal;
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option.minimum = slider->minimum();
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option.maximum = slider->maximum();
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option.tickPosition = slider->tickPosition();
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option.tickInterval = slider->tickInterval();
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option.upsideDown = slider->invertedAppearance() != (option.direction == Qt::RightToLeft);
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option.direction = Qt::LeftToRight;
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option.sliderPosition = slider->sliderPosition();
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option.sliderValue = slider->value();
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option.singleStep = slider->singleStep();
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option.pageStep = slider->pageStep();
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const QRect groove = slider->style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderGroove, slider);
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const QRect knob = slider->style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, slider);
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const QPoint point = press->position().toPoint();
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// The knob itself drags from where it is.
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if (knob.contains(point) || groove.width() <= knob.width())
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return false;
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// Down first, as Swift's editing begins before the value.
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slider->setSliderDown(true);
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slider->setValue(QStyle::sliderValueFromPosition(slider->minimum(), slider->maximum(), point.x() - groove.x() - knob.width() / 2,
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groove.width() - knob.width(), option.upsideDown));
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// A rounding owner may move the knob: press there.
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option.sliderPosition = slider->sliderPosition();
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option.sliderValue = slider->value();
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const QRect moved = slider->style()->subControlRect(QStyle::CC_Slider, &option, QStyle::SC_SliderHandle, slider);
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const QPoint inside(std::clamp(point.x(), moved.left(), moved.right()), std::clamp(point.y(), moved.top(), moved.bottom()));
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const QPointF shift = inside - point;
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QMouseEvent forwarded(QEvent::MouseButtonPress, inside, press->scenePosition() + shift, press->globalPosition() + shift, Qt::LeftButton,
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Qt::LeftButton, press->modifiers());
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QCoreApplication::sendEvent(slider, &forwarded);
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return true;
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}
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};
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}
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void SliderSnap::install()
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{
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// Once, as Swift's lazy static swaps the method once.
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static const bool installed = [] {
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qApp->installEventFilter(new Snap(qApp));
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return true;
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}();
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(void)installed;
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}
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