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177 lines
3.9 KiB
C++
177 lines
3.9 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** SPDX-License-Identifier: BSD-3-Clause
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**
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****************************************************************************/
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#include "DolphinQt/QtUtils/FlowLayout.h"
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#include <QtWidgets>
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FlowLayout::FlowLayout(QWidget* parent, int margin, int h_spacing, int v_spacing)
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: QLayout(parent), m_h_space(h_spacing), m_v_space(v_spacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::FlowLayout(int margin, int h_spacing, int v_spacing)
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: m_h_space(h_spacing), m_v_space(v_spacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::~FlowLayout()
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{
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while (QLayoutItem* item = takeAt(0))
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delete item;
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}
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void FlowLayout::addItem(QLayoutItem* item)
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{
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m_item_list.append(item);
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}
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int FlowLayout::horizontalSpacing() const
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{
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if (m_h_space >= 0)
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{
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return m_h_space;
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}
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else
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{
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return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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}
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}
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int FlowLayout::verticalSpacing() const
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{
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if (m_v_space >= 0)
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{
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return m_v_space;
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}
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else
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{
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return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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}
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}
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int FlowLayout::count() const
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{
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return m_item_list.size();
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}
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QLayoutItem* FlowLayout::itemAt(int index) const
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{
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return m_item_list.value(index);
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}
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QLayoutItem* FlowLayout::takeAt(int index)
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{
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if (index >= 0 && index < m_item_list.size())
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return m_item_list.takeAt(index);
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else
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return 0;
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}
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Qt::Orientations FlowLayout::expandingDirections() const
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{
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return {};
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}
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bool FlowLayout::hasHeightForWidth() const
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{
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return true;
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}
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int FlowLayout::heightForWidth(int width) const
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{
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int height = doLayout(QRect(0, 0, width, 0), true);
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return height;
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}
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void FlowLayout::setGeometry(const QRect& rect)
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{
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QLayout::setGeometry(rect);
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doLayout(rect, false);
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}
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QSize FlowLayout::sizeHint() const
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{
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return minimumSize();
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}
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QSize FlowLayout::minimumSize() const
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{
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QSize size;
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for (const auto& item : m_item_list)
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size = size.expandedTo(item->minimumSize());
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// Any direction's margin works, as they all set the same within the constructor.
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int margin = 0;
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getContentsMargins(&margin, nullptr, nullptr, nullptr);
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size += QSize(2 * margin, 2 * margin);
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return size;
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}
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int FlowLayout::doLayout(const QRect& rect, bool testOnly) const
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{
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int left, top, right, bottom;
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getContentsMargins(&left, &top, &right, &bottom);
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QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
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int x = effectiveRect.x();
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int y = effectiveRect.y();
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int lineHeight = 0;
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for (const auto& item : m_item_list)
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{
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QWidget* wid = item->widget();
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int spaceX = horizontalSpacing();
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if (spaceX == -1)
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spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton,
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Qt::Horizontal);
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int spaceY = verticalSpacing();
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if (spaceY == -1)
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spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton,
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Qt::Vertical);
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int nextX = x + item->sizeHint().width() + spaceX;
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if (nextX - spaceX > effectiveRect.right() && lineHeight > 0)
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{
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x = effectiveRect.x();
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y = y + lineHeight + spaceY;
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nextX = x + item->sizeHint().width() + spaceX;
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lineHeight = 0;
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}
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if (!testOnly)
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item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
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x = nextX;
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lineHeight = qMax(lineHeight, item->sizeHint().height());
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}
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return y + lineHeight - rect.y() + bottom;
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}
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int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
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{
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QObject* parent = this->parent();
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if (!parent)
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{
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return -1;
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}
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else if (parent->isWidgetType())
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{
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QWidget* pw = static_cast<QWidget*>(parent);
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return pw->style()->pixelMetric(pm, 0, pw);
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}
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else
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{
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return static_cast<QLayout*>(parent)->spacing();
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}
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}
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