| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #ifndef QPAINTDEVICEWINDOW_P_H |
| 5 | #define QPAINTDEVICEWINDOW_P_H |
| 6 | |
| 7 | // |
| 8 | // W A R N I N G |
| 9 | // ------------- |
| 10 | // |
| 11 | // This file is not part of the Qt API. It exists purely as an |
| 12 | // implementation detail. This header file may change from version to |
| 13 | // version without notice, or even be removed. |
| 14 | // |
| 15 | // We mean it. |
| 16 | // |
| 17 | |
| 18 | #include <QtGui/private/qtguiglobal_p.h> |
| 19 | #include <QtGui/QPaintDeviceWindow> |
| 20 | #include <QtCore/QCoreApplication> |
| 21 | #include <QtGui/private/qwindow_p.h> |
| 22 | #include <QtGui/QPaintEvent> |
| 23 | |
| 24 | QT_BEGIN_NAMESPACE |
| 25 | |
| 26 | class Q_GUI_EXPORT QPaintDeviceWindowPrivate : public QWindowPrivate |
| 27 | { |
| 28 | Q_DECLARE_PUBLIC(QPaintDeviceWindow) |
| 29 | |
| 30 | public: |
| 31 | QPaintDeviceWindowPrivate(); |
| 32 | ~QPaintDeviceWindowPrivate() override; |
| 33 | |
| 34 | virtual void beginPaint(const QRegion ®ion) |
| 35 | { |
| 36 | Q_UNUSED(region); |
| 37 | } |
| 38 | |
| 39 | virtual void endPaint() |
| 40 | { |
| 41 | } |
| 42 | |
| 43 | virtual void flush(const QRegion ®ion) |
| 44 | { |
| 45 | Q_UNUSED(region); |
| 46 | } |
| 47 | |
| 48 | bool paint(const QRegion ®ion) |
| 49 | { |
| 50 | Q_Q(QPaintDeviceWindow); |
| 51 | QRegion toPaint = region & dirtyRegion; |
| 52 | if (toPaint.isEmpty()) |
| 53 | return false; |
| 54 | |
| 55 | // Clear the region now. The overridden functions may call update(). |
| 56 | dirtyRegion -= toPaint; |
| 57 | |
| 58 | beginPaint(region: toPaint); |
| 59 | |
| 60 | QPaintEvent paintEvent(toPaint); |
| 61 | q->paintEvent(event: &paintEvent); |
| 62 | |
| 63 | endPaint(); |
| 64 | |
| 65 | return true; |
| 66 | } |
| 67 | |
| 68 | void doFlush(const QRegion ®ion) |
| 69 | { |
| 70 | QRegion toFlush = region; |
| 71 | if (paint(region: toFlush)) |
| 72 | flush(region: toFlush); |
| 73 | } |
| 74 | |
| 75 | void handleUpdateEvent() |
| 76 | { |
| 77 | if (dirtyRegion.isEmpty()) |
| 78 | return; |
| 79 | doFlush(region: dirtyRegion); |
| 80 | } |
| 81 | |
| 82 | void markWindowAsDirty() |
| 83 | { |
| 84 | Q_Q(QPaintDeviceWindow); |
| 85 | dirtyRegion = QRect(QPoint(0, 0), q->size()); |
| 86 | } |
| 87 | |
| 88 | private: |
| 89 | QRegion dirtyRegion; |
| 90 | }; |
| 91 | |
| 92 | |
| 93 | QT_END_NAMESPACE |
| 94 | |
| 95 | #endif //QPAINTDEVICEWINDOW_P_H |
| 96 |