diff options
Diffstat (limited to 'tests/manual/examples/widgets/graphicsview/flowlayout')
7 files changed, 326 insertions, 0 deletions
diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/CMakeLists.txt b/tests/manual/examples/widgets/graphicsview/flowlayout/CMakeLists.txt new file mode 100644 index 0000000000..66ad4707b5 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/CMakeLists.txt @@ -0,0 +1,38 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +cmake_minimum_required(VERSION 3.16) +project(flowlayout LANGUAGES CXX) + +if(NOT DEFINED INSTALL_EXAMPLESDIR) + set(INSTALL_EXAMPLESDIR "examples") +endif() + +set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/graphicsview_flowlayout") + +find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets) + +qt_standard_project_setup() + +qt_add_executable(graphicsview_flowlayout + flowlayout.cpp flowlayout.h + main.cpp + window.cpp window.h +) + +set_target_properties(graphicsview_flowlayout PROPERTIES + WIN32_EXECUTABLE TRUE + MACOSX_BUNDLE TRUE +) + +target_link_libraries(graphicsview_flowlayout PRIVATE + Qt6::Core + Qt6::Gui + Qt6::Widgets +) + +install(TARGETS graphicsview_flowlayout + RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}" + BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}" + LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}" +) diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.cpp b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.cpp new file mode 100644 index 0000000000..ab5f4717b3 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.cpp @@ -0,0 +1,170 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "flowlayout.h" + +#include <QtMath> + +FlowLayout::FlowLayout(QGraphicsLayoutItem *parent) : QGraphicsLayout(parent) +{ + QSizePolicy sp = sizePolicy(); + sp.setHeightForWidth(true); + setSizePolicy(sp); +} + +void FlowLayout::insertItem(int index, QGraphicsLayoutItem *item) +{ + item->setParentLayoutItem(this); + if (index > m_items.count() || index < 0) + index = m_items.count(); + m_items.insert(index, item); + invalidate(); +} + +int FlowLayout::count() const +{ + return m_items.count(); +} + +QGraphicsLayoutItem *FlowLayout::itemAt(int index) const +{ + return m_items.value(index); +} + +void FlowLayout::removeAt(int index) +{ + m_items.removeAt(index); + invalidate(); +} + +qreal FlowLayout::spacing(Qt::Orientation o) const +{ + return m_spacing[int(o) - 1]; +} + +void FlowLayout::setSpacing(Qt::Orientations o, qreal spacing) +{ + if (o & Qt::Horizontal) + m_spacing[0] = spacing; + if (o & Qt::Vertical) + m_spacing[1] = spacing; +} + +void FlowLayout::setGeometry(const QRectF &geom) +{ + QGraphicsLayout::setGeometry(geom); + doLayout(geom, true); +} + +qreal FlowLayout::doLayout(const QRectF &geom, bool applyNewGeometry) const +{ + qreal left, top, right, bottom; + getContentsMargins(&left, &top, &right, &bottom); + const qreal maxw = geom.width() - left - right; + + qreal x = 0; + qreal y = 0; + qreal maxRowHeight = 0; + QSizeF pref; + for (QGraphicsLayoutItem *item : m_items) { + pref = item->effectiveSizeHint(Qt::PreferredSize); + maxRowHeight = qMax(maxRowHeight, pref.height()); + + qreal next_x; + next_x = x + pref.width(); + if (next_x > maxw) { + if (qFuzzyIsNull(x)) { + pref.setWidth(maxw); + } else { + x = 0; + next_x = pref.width(); + } + y += maxRowHeight + spacing(Qt::Vertical); + maxRowHeight = 0; + } + + if (applyNewGeometry) + item->setGeometry(QRectF(QPointF(left + x, top + y), pref)); + x = next_x + spacing(Qt::Horizontal); + } + maxRowHeight = qMax(maxRowHeight, pref.height()); + return top + y + maxRowHeight + bottom; +} + +QSizeF FlowLayout::minSize(const QSizeF &constraint) const +{ + QSizeF size(0, 0); + qreal left, top, right, bottom; + getContentsMargins(&left, &top, &right, &bottom); + if (constraint.width() >= 0) { // height for width + const qreal height = doLayout(QRectF(QPointF(0,0), constraint), false); + size = QSizeF(constraint.width(), height); + } else if (constraint.height() >= 0) { // width for height? + // not supported + } else { + for (const QGraphicsLayoutItem *item : std::as_const(m_items)) + size = size.expandedTo(item->effectiveSizeHint(Qt::MinimumSize)); + size += QSizeF(left + right, top + bottom); + } + return size; +} + +QSizeF FlowLayout::prefSize() const +{ + qreal left, right; + getContentsMargins(&left, nullptr, &right, nullptr); + + qreal maxh = 0; + qreal totalWidth = 0; + for (const QGraphicsLayoutItem *item : std::as_const(m_items)) { + if (totalWidth > 0) + totalWidth += spacing(Qt::Horizontal); + QSizeF pref = item->effectiveSizeHint(Qt::PreferredSize); + totalWidth += pref.width(); + maxh = qMax(maxh, pref.height()); + } + maxh += spacing(Qt::Vertical); + + const qreal goldenAspectRatio = 1.61803399; + qreal w = qSqrt(totalWidth * maxh * goldenAspectRatio) + left + right; + + return minSize(QSizeF(w, -1)); +} + +QSizeF FlowLayout::maxSize() const +{ + qreal totalWidth = 0; + qreal totalHeight = 0; + for (const QGraphicsLayoutItem *item : std::as_const(m_items)) { + if (totalWidth > 0) + totalWidth += spacing(Qt::Horizontal); + if (totalHeight > 0) + totalHeight += spacing(Qt::Vertical); + QSizeF pref = item->effectiveSizeHint(Qt::PreferredSize); + totalWidth += pref.width(); + totalHeight += pref.height(); + } + + qreal left, top, right, bottom; + getContentsMargins(&left, &top, &right, &bottom); + return QSizeF(left + totalWidth + right, top + totalHeight + bottom); +} + +QSizeF FlowLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const +{ + QSizeF sh = constraint; + switch (which) { + case Qt::PreferredSize: + sh = prefSize(); + break; + case Qt::MinimumSize: + sh = minSize(constraint); + break; + case Qt::MaximumSize: + sh = maxSize(); + break; + default: + break; + } + return sh; +} diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.h b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.h new file mode 100644 index 0000000000..028394827a --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.h @@ -0,0 +1,44 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#ifndef FLOWLAYOUT_H +#define FLOWLAYOUT_H + +#include <QGraphicsLayout> + +class FlowLayout : public QGraphicsLayout +{ +public: + FlowLayout(QGraphicsLayoutItem *parent = nullptr); + inline void addItem(QGraphicsLayoutItem *item); + void insertItem(int index, QGraphicsLayoutItem *item); + void setSpacing(Qt::Orientations o, qreal spacing); + qreal spacing(Qt::Orientation o) const; + + // inherited functions + void setGeometry(const QRectF &geom) override; + + int count() const override; + QGraphicsLayoutItem *itemAt(int index) const override; + void removeAt(int index) override; + +protected: + QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const override; + +private: + qreal doLayout(const QRectF &geom, bool applyNewGeometry) const; + QSizeF minSize(const QSizeF &constraint) const; + QSizeF prefSize() const; + QSizeF maxSize() const; + + QList<QGraphicsLayoutItem *> m_items; + qreal m_spacing[2] = {6, 6}; +}; + + +inline void FlowLayout::addItem(QGraphicsLayoutItem *item) +{ + insertItem(-1, item); +} + +#endif // FLOWLAYOUT_H diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.pro b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.pro new file mode 100644 index 0000000000..7830e3a008 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/flowlayout.pro @@ -0,0 +1,10 @@ +QT += widgets + +QMAKE_PROJECT_NAME = flowlayout_graphicsview + +HEADERS += flowlayout.h window.h +SOURCES += flowlayout.cpp main.cpp window.cpp + +# install +target.path = $$[QT_INSTALL_EXAMPLES]/widgets/graphicsview/flowlayout +INSTALLS += target diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/main.cpp b/tests/manual/examples/widgets/graphicsview/flowlayout/main.cpp new file mode 100644 index 0000000000..118b404870 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/main.cpp @@ -0,0 +1,24 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause +//! [1] +#include "window.h" + +#include <QApplication> +#include <QGraphicsView> + + +int main(int argc, char *argv[]) +{ + QApplication app(argc, argv); + + QGraphicsScene scene; + QGraphicsView view(&scene); + Window *w = new Window; + scene.addItem(w); + + view.resize(400, 300); + view.show(); + + return app.exec(); +} +//! [1] diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/window.cpp b/tests/manual/examples/widgets/graphicsview/flowlayout/window.cpp new file mode 100644 index 0000000000..ed9a5720d3 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/window.cpp @@ -0,0 +1,24 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#include "window.h" +#include "flowlayout.h" + +#include <QGraphicsProxyWidget> +#include <QLabel> + +Window::Window(QGraphicsItem *parent) : QGraphicsWidget(parent, Qt::Window) +{ + FlowLayout *lay = new FlowLayout; + const QString sentence(QLatin1String("I am not bothered by the fact that I am unknown." + " I am bothered when I do not know others. (Confucius)")); + const QList<QStringView> words = QStringView{ sentence }.split(QLatin1Char(' '), Qt::SkipEmptyParts); + for (const QStringView &word : words) { + QGraphicsProxyWidget *proxy = new QGraphicsProxyWidget(this); + QLabel *label = new QLabel(word.toString()); + label->setFrameStyle(QFrame::Box | QFrame::Plain); + proxy->setWidget(label); + lay->addItem(proxy); + } + setLayout(lay); +} diff --git a/tests/manual/examples/widgets/graphicsview/flowlayout/window.h b/tests/manual/examples/widgets/graphicsview/flowlayout/window.h new file mode 100644 index 0000000000..2fc5570406 --- /dev/null +++ b/tests/manual/examples/widgets/graphicsview/flowlayout/window.h @@ -0,0 +1,16 @@ +// Copyright (C) 2016 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +#ifndef WINDOW_H +#define WINDOW_H + +#include <QGraphicsWidget> + +class Window : public QGraphicsWidget +{ + Q_OBJECT +public: + Window(QGraphicsItem *parent = nullptr); +}; + +#endif // WINDOW_H |