Qt: Re-introduce FlowLayout

src/duckstation-qt/CMakeLists.txt

@@ -70,6 +70,8 @@ set(SRCS
   emulationsettingswidget.cpp
   emulationsettingswidget.h
   emulationsettingswidget.ui
+  flowlayout.cpp
+  flowlayout.h
   foldersettingswidget.cpp
   foldersettingswidget.h
   foldersettingswidget.ui

src/duckstation-qt/duckstation-qt.vcxproj

@@ -19,6 +19,7 @@
     <ClCompile Include="emulationsettingswidget.cpp" />
     <ClCompile Include="debuggermodels.cpp" />
     <ClCompile Include="debuggerwindow.cpp" />
+    <ClCompile Include="flowlayout.cpp" />
     <ClCompile Include="foldersettingswidget.cpp" />
     <ClCompile Include="gamecheatsettingswidget.cpp" />
     <ClCompile Include="gamepatchsettingswidget.cpp" />
@@ -89,6 +90,7 @@
     <QtMoc Include="gamepatchsettingswidget.h" />
     <QtMoc Include="isobrowserwindow.h" />
     <QtMoc Include="debuggercodeview.h" />
+    <ClInclude Include="flowlayout.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="resource.h" />
     <QtMoc Include="selectdiscdialog.h" />

src/duckstation-qt/duckstation-qt.vcxproj.filters

@@ -50,6 +50,7 @@
     <ClCompile Include="debuggercodeview.cpp" />
     <ClCompile Include="togglebutton.cpp" />
     <ClCompile Include="memoryeditorwindow.cpp" />
+    <ClCompile Include="flowlayout.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="qtutils.h" />
@@ -57,6 +58,7 @@
     <ClInclude Include="resource.h" />
     <ClInclude Include="controllersettingwidgetbinder.h" />
     <ClInclude Include="pch.h" />
+    <ClInclude Include="flowlayout.h" />
   </ItemGroup>
   <ItemGroup>
     <Filter Include="resources">

src/duckstation-qt/flowlayout.cpp

@@ -0,0 +1,183 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "flowlayout.h"
+
+//! [1]
+FlowLayout::FlowLayout(QWidget* parent, int margin, int hSpacing, int vSpacing)
+  : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
+{
+  setContentsMargins(margin, margin, margin, margin);
+}
+
+FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing) : m_hSpace(hSpacing), m_vSpace(vSpacing)
+{
+  setContentsMargins(margin, margin, margin, margin);
+}
+//! [1]
+
+//! [2]
+FlowLayout::~FlowLayout()
+{
+  QLayoutItem* item;
+  while ((item = takeAt(0)))
+    delete item;
+}
+//! [2]
+
+//! [3]
+void FlowLayout::addItem(QLayoutItem* item)
+{
+  itemList.append(item);
+}
+//! [3]
+
+//! [4]
+int FlowLayout::horizontalSpacing() const
+{
+  if (m_hSpace >= 0)
+  {
+    return m_hSpace;
+  }
+  else
+  {
+    return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
+  }
+}
+
+int FlowLayout::verticalSpacing() const
+{
+  if (m_vSpace >= 0)
+  {
+    return m_vSpace;
+  }
+  else
+  {
+    return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
+  }
+}
+//! [4]
+
+//! [5]
+int FlowLayout::count() const
+{
+  return itemList.size();
+}
+
+QLayoutItem* FlowLayout::itemAt(int index) const
+{
+  return itemList.value(index);
+}
+
+QLayoutItem* FlowLayout::takeAt(int index)
+{
+  if (index >= 0 && index < itemList.size())
+    return itemList.takeAt(index);
+  return nullptr;
+}
+//! [5]
+
+//! [6]
+Qt::Orientations FlowLayout::expandingDirections() const
+{
+  return {};
+}
+//! [6]
+
+//! [7]
+bool FlowLayout::hasHeightForWidth() const
+{
+  return true;
+}
+
+int FlowLayout::heightForWidth(int width) const
+{
+  int height = doLayout(QRect(0, 0, width, 0), true);
+  return height;
+}
+//! [7]
+
+//! [8]
+void FlowLayout::setGeometry(const QRect& rect)
+{
+  QLayout::setGeometry(rect);
+  doLayout(rect, false);
+}
+
+QSize FlowLayout::sizeHint() const
+{
+  return minimumSize();
+}
+
+QSize FlowLayout::minimumSize() const
+{
+  QSize size;
+  for (const QLayoutItem* item : std::as_const(itemList))
+    size = size.expandedTo(item->minimumSize());
+
+  const QMargins margins = contentsMargins();
+  size += QSize(margins.left() + margins.right(), margins.top() + margins.bottom());
+  return size;
+}
+//! [8]
+
+//! [9]
+int FlowLayout::doLayout(const QRect& rect, bool testOnly) const
+{
+  int left, top, right, bottom;
+  getContentsMargins(&left, &top, &right, &bottom);
+  QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
+  int x = effectiveRect.x();
+  int y = effectiveRect.y();
+  int lineHeight = 0;
+  //! [9]
+
+  //! [10]
+  for (QLayoutItem* item : std::as_const(itemList))
+  {
+    const QWidget* wid = item->widget();
+    int spaceX = horizontalSpacing();
+    if (spaceX == -1)
+      spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
+    int spaceY = verticalSpacing();
+    if (spaceY == -1)
+      spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
+    //! [10]
+    //! [11]
+    int nextX = x + item->sizeHint().width() + spaceX;
+    if (nextX - spaceX > effectiveRect.right() && lineHeight > 0)
+    {
+      x = effectiveRect.x();
+      y = y + lineHeight + spaceY;
+      nextX = x + item->sizeHint().width() + spaceX;
+      lineHeight = 0;
+    }
+
+    if (!testOnly)
+      item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
+
+    x = nextX;
+    lineHeight = qMax(lineHeight, item->sizeHint().height());
+  }
+  return y + lineHeight - rect.y() + bottom;
+}
+//! [11]
+//! [12]
+int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
+{
+  QObject* parent = this->parent();
+  if (!parent)
+  {
+    return -1;
+  }
+  else if (parent->isWidgetType())
+  {
+    QWidget* pw = static_cast<QWidget*>(parent);
+    return pw->style()->pixelMetric(pm, nullptr, pw);
+  }
+  else
+  {
+    return static_cast<QLayout*>(parent)->spacing();
+  }
+}
+//! [12]

src/duckstation-qt/flowlayout.h

@@ -0,0 +1,41 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#pragma once
+
+#include <QtCore/QRect>
+#include <QtWidgets/QLayout>
+#include <QtWidgets/QStyle>
+
+// https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/layouts/flowlayout?h=6.9
+
+//! [0]
+class FlowLayout : public QLayout
+{
+public:
+  explicit FlowLayout(QWidget* parent, int margin = -1, int hSpacing = -1, int vSpacing = -1);
+  explicit FlowLayout(int margin = -1, int hSpacing = -1, int vSpacing = -1);
+  ~FlowLayout();
+
+  void addItem(QLayoutItem* item) override;
+  int horizontalSpacing() const;
+  int verticalSpacing() const;
+  Qt::Orientations expandingDirections() const override;
+  bool hasHeightForWidth() const override;
+  int heightForWidth(int) const override;
+  int count() const override;
+  QLayoutItem* itemAt(int index) const override;
+  QSize minimumSize() const override;
+  void setGeometry(const QRect& rect) override;
+  QSize sizeHint() const override;
+  QLayoutItem* takeAt(int index) override;
+
+private:
+  int doLayout(const QRect& rect, bool testOnly) const;
+  int smartSpacing(QStyle::PixelMetric pm) const;
+
+  QList<QLayoutItem*> itemList;
+  int m_hSpace;
+  int m_vSpace;
+};
+//! [0]