rankun
7 years ago
parent
be616458a2
commit
4e9b7c3aa1
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#ifndef COCOAMOUSETAP_H
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#define COCOAMOUSETAP_H
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#include <QThread>
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#include <QSemaphore>
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struct MouseEventTapData;
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class QWidget;
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class CocoaMouseTap : public QThread
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{
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private:
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CocoaMouseTap(QObject *parent = Q_NULLPTR);
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~CocoaMouseTap();
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public:
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static CocoaMouseTap* getInstance();
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void initMouseEventTap();
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void quitMouseEventTap();
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void enableMouseEventTap(QWidget* widget, bool enabled);
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protected:
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void run() override;
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private:
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MouseEventTapData *m_tapData = Q_NULLPTR;
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QSemaphore m_runloopStartedSemaphore;
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static CocoaMouseTap *s_instance;
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};
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#endif // COCOAMOUSETAP_H
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#import <Cocoa/Cocoa.h>
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#include <QDebug>
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#include <QWidget>
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#include "cocoamousetap.h"
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static const CGEventMask movementEventsMask =
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CGEventMaskBit(kCGEventLeftMouseDragged)
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| CGEventMaskBit(kCGEventRightMouseDragged)
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| CGEventMaskBit(kCGEventMouseMoved);
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static const CGEventMask allGrabbedEventsMask =
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CGEventMaskBit(kCGEventLeftMouseDown) | CGEventMaskBit(kCGEventLeftMouseUp)
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| CGEventMaskBit(kCGEventRightMouseDown) | CGEventMaskBit(kCGEventRightMouseUp)
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| CGEventMaskBit(kCGEventOtherMouseDown) | CGEventMaskBit(kCGEventOtherMouseUp)
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| CGEventMaskBit(kCGEventLeftMouseDragged) | CGEventMaskBit(kCGEventRightMouseDragged)
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| CGEventMaskBit(kCGEventMouseMoved);
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typedef struct MouseEventTapData{
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CFMachPortRef tap = Q_NULLPTR;
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CFRunLoopRef runloop = Q_NULLPTR;
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CFRunLoopSourceRef runloopSource = Q_NULLPTR;
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QWidget* widget = Q_NULLPTR;
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} MouseEventTapData;
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static CGEventRef Cocoa_MouseTapCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon)
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{
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Q_UNUSED(proxy);
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MouseEventTapData *tapdata = (MouseEventTapData*)refcon;
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NSView *nsview;
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NSWindow *nswindow;
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NSRect windowRect;
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NSRect newWindowRect;
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CGPoint eventLocation;
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switch (type) {
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case kCGEventTapDisabledByTimeout:
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{
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CGEventTapEnable(tapdata->tap, true);
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return NULL;
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}
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case kCGEventTapDisabledByUserInput:
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{
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return NULL;
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}
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default:
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break;
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}
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if (!tapdata->widget) {
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return event;
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}
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// get nswindow from qt widget
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nsview = (NSView *)tapdata->widget->window()->winId();
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if (!nsview) {
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return event;
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}
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nswindow = [nsview window];
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eventLocation = CGEventGetUnflippedLocation(event);
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windowRect = [nswindow contentRectForFrameRect:[nswindow frame]];
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newWindowRect = NSMakeRect(windowRect.origin.x, windowRect.origin.y,
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windowRect.size.width - 10, windowRect.size.height - 10);
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qDebug() << newWindowRect.origin.x << newWindowRect.origin.y
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<< newWindowRect.size.width << newWindowRect.size.height;
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if (!NSMouseInRect(NSPointFromCGPoint(eventLocation), newWindowRect, NO)) {
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/* This is in CGs global screenspace coordinate system, which has a
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* flipped Y.
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*/
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CGPoint newLocation = CGEventGetLocation(event);
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if (eventLocation.x < NSMinX(windowRect)) {
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newLocation.x = NSMinX(windowRect);
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} else if (eventLocation.x >= NSMaxX(windowRect)) {
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newLocation.x = NSMaxX(windowRect) - 1.0;
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}
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if (eventLocation.y <= NSMinY(windowRect)) {
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newLocation.y -= (NSMinY(windowRect) - eventLocation.y + 1);
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} else if (eventLocation.y > NSMaxY(windowRect)) {
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newLocation.y += (eventLocation.y - NSMaxY(windowRect));
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}
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CGWarpMouseCursorPosition(newLocation);
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CGAssociateMouseAndMouseCursorPosition(YES);
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if ((CGEventMaskBit(type) & movementEventsMask) == 0) {
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/* For click events, we just constrain the event to the window, so
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* no other app receives the click event. We can't due the same to
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* movement events, since they mean that our warp cursor above
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* behaves strangely.
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*/
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CGEventSetLocation(event, newLocation);
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}
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}
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return event;
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}
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static void SemaphorePostCallback(CFRunLoopTimerRef timer, void *info)
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{
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Q_UNUSED(timer);
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QSemaphore *runloopStartedSemaphore = (QSemaphore *)info;
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if (runloopStartedSemaphore) {
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runloopStartedSemaphore->release();
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}
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}
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CocoaMouseTap * CocoaMouseTap::s_instance = Q_NULLPTR;
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CocoaMouseTap::CocoaMouseTap(QObject *parent)
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: QThread(parent)
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{
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m_tapData = new MouseEventTapData;
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}
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CocoaMouseTap::~CocoaMouseTap()
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{
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if (m_tapData) {
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delete m_tapData;
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m_tapData = Q_NULLPTR;
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}
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}
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CocoaMouseTap *CocoaMouseTap::getInstance()
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{
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if (s_instance == Q_NULLPTR) {
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s_instance = new CocoaMouseTap();
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}
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return s_instance;
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}
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void CocoaMouseTap::initMouseEventTap()
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{
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if (!m_tapData) {
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return;
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}
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m_tapData->tap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap,
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kCGEventTapOptionDefault, allGrabbedEventsMask,
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&Cocoa_MouseTapCallback, m_tapData);
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if (!m_tapData->tap) {
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return;
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}
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/* Tap starts disabled, until app requests mouse grab */
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CGEventTapEnable(m_tapData->tap, false);
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start();
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}
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void CocoaMouseTap::quitMouseEventTap()
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{
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bool status;
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if (m_tapData == Q_NULLPTR || m_tapData->tap == Q_NULLPTR) {
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/* event tap was already cleaned up (possibly due to CGEventTapCreate
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* returning null.)
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*/
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return;
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}
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/* Ensure that the runloop has been started first.
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* TODO: Move this to InitMouseEventTap, check for error conditions that can
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* happen in Cocoa_MouseTapThread, and fall back to the non-EventTap way of
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* grabbing the mouse if it fails to Init.
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*/
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status = m_runloopStartedSemaphore.tryAcquire(1, 5000);
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if (status) {
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/* Then stop it, which will cause Cocoa_MouseTapThread to return. */
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CFRunLoopStop(m_tapData->runloop);
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/* And then wait for Cocoa_MouseTapThread to finish cleaning up. It
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* releases some of the pointers in tapdata. */
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wait();
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}
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}
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void CocoaMouseTap::enableMouseEventTap(QWidget* widget, bool enabled)
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{
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if (m_tapData && m_tapData->tap)
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{
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enabled ? m_tapData->widget = widget : m_tapData->widget = Q_NULLPTR;
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CGEventTapEnable(m_tapData->tap, enabled);
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}
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}
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void CocoaMouseTap::run()
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{
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/* Tap was created on main thread but we own it now. */
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CFMachPortRef eventTap = m_tapData->tap;
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if (eventTap) {
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/* Try to create a runloop source we can schedule. */
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CFRunLoopSourceRef runloopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
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if (runloopSource) {
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m_tapData->runloopSource = runloopSource;
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} else {
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CFRelease(eventTap);
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m_runloopStartedSemaphore.release();
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/* TODO: Both here and in the return below, set some state in
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* tapdata to indicate that initialization failed, which we should
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* check in InitMouseEventTap, after we move the semaphore check
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* from Quit to Init.
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*/
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return;
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}
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} else {
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m_runloopStartedSemaphore.release();
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return;
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}
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m_tapData->runloop = CFRunLoopGetCurrent();
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CFRunLoopAddSource(m_tapData->runloop, m_tapData->runloopSource, kCFRunLoopCommonModes);
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CFRunLoopTimerContext context = {.info = &m_runloopStartedSemaphore};
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/* We signal the runloop started semaphore *after* the run loop has started, indicating it's safe to CFRunLoopStop it. */
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CFRunLoopTimerRef timer = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent(), 0, 0, 0, &SemaphorePostCallback, &context);
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CFRunLoopAddTimer(m_tapData->runloop, timer, kCFRunLoopCommonModes);
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CFRelease(timer);
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/* Run the event loop to handle events in the event tap. */
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CFRunLoopRun();
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/* Make sure this is signaled so that SDL_QuitMouseEventTap knows it can safely SDL_WaitThread for us. */
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if (m_runloopStartedSemaphore.available() < 1) {
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m_runloopStartedSemaphore.release();
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}
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CFRunLoopRemoveSource(m_tapData->runloop, m_tapData->runloopSource, kCFRunLoopCommonModes);
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/* Clean up. */
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CGEventTapEnable(m_tapData->tap, false);
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CFRelease(m_tapData->runloopSource);
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CFRelease(m_tapData->tap);
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m_tapData->runloopSource = Q_NULLPTR;
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m_tapData->tap = Q_NULLPTR;
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return;
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}
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@ -0,0 +1,6 @@
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mac {
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HEADERS += $$PWD/cocoamousetap.h
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OBJECTIVE_SOURCES += $$PWD/cocoamousetap.mm
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LIBS += -framework Appkit
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QMAKE_CFLAGS += -mmacosx-version-min=10.6
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}
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