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Fix rendering of the Qt platform example with high-dpi

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- Provide a C++ platform event for the scale factor change and send it
- Report the correct logical and physical sizes to Slint
This commit is contained in:
Simon Hausmann 2023-05-24 15:33:37 +02:00 • committed by Simon Hausmann
parent 459f810bd8
commit dd61890e23
3 changed files with 34 additions and 12 deletions
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23
api/cpp/tests/manual/platform_qt/main.cpp
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@ -56,8 +56,7 @@ class MyWindow : public QWindow, public slint_platform::WindowAdapter
public:
MyWindow(QWindow *parentWindow = nullptr) : QWindow(parentWindow)
{
m_renderer.emplace(window_handle_for_qt_window(this),
slint::PhysicalSize({ uint32_t(width()), uint32_t(height()) }));
m_renderer.emplace(window_handle_for_qt_window(this), physical_size());
}
slint_platform::AbstractRenderer &renderer() override { return m_renderer.value(); }
@ -71,8 +70,7 @@ public:
{
slint_platform::update_timers_and_animations();
auto windowSize = slint::PhysicalSize({ uint32_t(width()), uint32_t(height()) });
m_renderer->render(window(), windowSize);
m_renderer->render(window(), physical_size());
if (has_active_animations()) {
requestUpdate();
@ -91,6 +89,8 @@ public:
void show() const override
{
const_cast<WindowAdapter *>(static_cast<const WindowAdapter *>(this))
->dispatch_scale_factor_change_event(devicePixelRatio());
auto window = const_cast<QWindow *>(static_cast<const QWindow *>(this));
window->QWindow::show();
m_renderer->show();
@ -102,21 +102,22 @@ public:
}
slint::PhysicalSize physical_size() const override
{
auto s = size();
return slint::PhysicalSize({ uint32_t(s.width()), uint32_t(s.height()) });
auto windowSize = slint::LogicalSize({ float(width()), float(height()) });
float scale_factor = devicePixelRatio();
return slint::PhysicalSize({ uint32_t(windowSize.width * scale_factor),
uint32_t(windowSize.height * scale_factor) });
}
void request_redraw() const override { const_cast<MyWindow *>(this)->requestUpdate(); }
void resizeEvent(QResizeEvent *ev) override
{
auto windowSize = slint::PhysicalSize(
{ uint32_t(ev->size().width()), uint32_t(ev->size().height()) });
m_renderer->resize(windowSize);
auto logicalSize = ev->size();
float scale_factor = devicePixelRatio();
m_renderer->resize(slint::PhysicalSize({ uint32_t(logicalSize.width() * scale_factor),
uint32_t(logicalSize.height() * scale_factor) }));
WindowAdapter::dispatch_resize_event(
slint::LogicalSize({ float(windowSize.width) / scale_factor,
float(windowSize.height) / scale_factor }));
slint::LogicalSize({ float(logicalSize.width()), float(logicalSize.height()) }));
}
void mousePressEvent(QMouseEvent *event) override