mirror of
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317 lines
9.8 KiB
C++
317 lines
9.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022 Jon Beniston, M7RCE <jon@beniston.com> //
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// Copyright (C) 2016 The Qt Company Ltd.
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QtWidgets>
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#include "featurelayout.h"
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FeatureLayout::FeatureLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
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: QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FeatureLayout::FeatureLayout(int margin, int hSpacing, int vSpacing)
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: m_hSpace(hSpacing), m_vSpace(vSpacing)
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{
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setContentsMargins(margin, margin, margin, margin);
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}
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FeatureLayout::~FeatureLayout()
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{
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QLayoutItem *item;
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while ((item = takeAt(0))) {
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delete item;
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}
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}
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void FeatureLayout::addItem(QLayoutItem *item)
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{
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itemList.append(item);
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}
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int FeatureLayout::horizontalSpacing() const
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{
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if (m_hSpace >= 0) {
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return m_hSpace;
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} else {
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return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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}
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}
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int FeatureLayout::verticalSpacing() const
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{
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if (m_vSpace >= 0) {
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return m_vSpace;
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} else {
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return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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}
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}
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bool FeatureLayout::hasHeightForWidth() const
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{
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return true;
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}
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int FeatureLayout::heightForWidth(int width) const
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{
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QSize size;
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if (m_orientation == Qt::Horizontal) {
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size = doLayoutHorizontally(QRect(0, 0, width, 0), true);
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} else {
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size = doLayoutVertically(QRect(0, 0, width, 0), true);
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}
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return size.height();
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}
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int FeatureLayout::count() const
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{
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return itemList.size();
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}
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QLayoutItem *FeatureLayout::itemAt(int index) const
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{
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return itemList.value(index);
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}
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QLayoutItem *FeatureLayout::takeAt(int index)
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{
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if (index >= 0 && index < itemList.size()) {
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return itemList.takeAt(index);
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}
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return nullptr;
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}
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void FeatureLayout::setOrientation(Qt::Orientation orientation)
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{
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m_orientation = orientation;
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}
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Qt::Orientations FeatureLayout::expandingDirections() const
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{
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return Qt::Horizontal | Qt::Vertical;
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}
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void FeatureLayout::setGeometry(const QRect &rect)
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{
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m_prevGeometry = rect;
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QLayout::setGeometry(rect);
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if (m_orientation == Qt::Horizontal) {
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doLayoutHorizontally(rect, false);
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} else {
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doLayoutVertically(rect, false);
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}
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}
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// Calculate preferred size
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QSize FeatureLayout::sizeHint() const
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{
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QSize size;
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if (m_orientation == Qt::Horizontal) {
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size = doLayoutHorizontally(m_prevGeometry, true);
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} else {
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size = doLayoutVertically(m_prevGeometry, true);
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}
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return size;
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}
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QSize FeatureLayout::minimumSize() const
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{
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QSize size;
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if (m_orientation == Qt::Horizontal) {
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size = doLayoutHorizontally(m_prevGeometry, true);
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} else {
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size = doLayoutVertically(m_prevGeometry, true);
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}
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return size;
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}
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QSize FeatureLayout::doLayoutHorizontally(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 lineWidth = 0;
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int spaceX = 0;
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int spaceY = 0;
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// Calculate space available for columns of widgets
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int maxWidthForColums = effectiveRect.width();
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if (itemList.size() > 0) {
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maxWidthForColums -= itemList[0]->minimumSize().width();
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}
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int minHeight = 0;
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int i = 0;
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for (QLayoutItem *item : qAsConst(itemList))
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{
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// Splitter is item 0, so skip
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if (i != 0)
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{
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const QWidget *wid = item->widget();
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spaceX = horizontalSpacing();
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if (spaceX == -1) {
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spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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}
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spaceY = verticalSpacing();
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if (spaceY == -1) {
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spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
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}
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// Layout in vertical columns
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int nextY = y + item->sizeHint().height() + spaceY;
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int nextX = x + lineWidth + spaceX + item->sizeHint().width();
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if (nextY - spaceY > effectiveRect.bottom() && lineWidth > 0 && nextX < maxWidthForColums)
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{
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minHeight = qMax(minHeight, y);
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y = effectiveRect.y();
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x = x + lineWidth + spaceX;
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nextY = y + item->sizeHint().height() + spaceY;
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lineWidth = 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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}
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y = nextY;
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lineWidth = qMax(lineWidth, item->sizeHint().width());
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minHeight = qMax(minHeight, y);
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}
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i++;
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}
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if (itemList.size() > 0)
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{
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// Now layout splitter
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QLayoutItem *item = itemList[0];
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y = effectiveRect.y();
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x = x + lineWidth + spaceX;
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if (!testOnly)
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{
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// Use all available space
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int splitterWidth = rect.width() - right - x;
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int splitterHeight = rect.height() - bottom - y;
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splitterWidth = qMax(splitterWidth, item->minimumSize().width());
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splitterHeight = qMax(splitterHeight, item->minimumSize().height());
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item->setGeometry(QRect(QPoint(x, y), QSize(splitterWidth, splitterHeight)));
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}
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lineWidth = item->minimumSize().width();
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y = y + item->minimumSize().height() + spaceY;
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}
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minHeight = qMax(minHeight, y);
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QSize size(x + lineWidth + right, minHeight - spaceY + bottom);
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return size;
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}
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QSize FeatureLayout::doLayoutVertically(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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int spaceX = 0;
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int spaceY = 0;
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// Calculate space available for rows of widgets
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int maxHeightForRows = effectiveRect.height();
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if (itemList.size() > 0) {
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maxHeightForRows -= itemList[0]->minimumSize().height();
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}
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int minWidth = 0;
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int i = 0;
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for (QLayoutItem *item : qAsConst(itemList))
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{
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// Splitter is item 0, so skip
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if (i != 0)
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{
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const QWidget *wid = item->widget();
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spaceX = horizontalSpacing();
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if (spaceX == -1) {
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spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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}
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spaceY = verticalSpacing();
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if (spaceY == -1) {
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spaceY = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
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}
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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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}
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x = nextX;
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lineHeight = qMax(lineHeight, item->sizeHint().height());
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minWidth = qMax(minWidth, x);
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}
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i++;
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}
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if (itemList.size() > 0)
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{
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// Now layout splitter
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QLayoutItem *item = itemList[0];
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x = effectiveRect.x();
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y = y + lineHeight + spaceY;
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if (!testOnly)
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{
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// Use all available space
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int splitterWidth = rect.width() - right - x;
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int splitterHeight = rect.height() - bottom - y;
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splitterWidth = qMax(splitterWidth, item->minimumSize().width());
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splitterHeight = qMax(splitterHeight, item->minimumSize().height());
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item->setGeometry(QRect(QPoint(x, y), QSize(splitterWidth, splitterHeight)));
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}
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lineHeight = item->minimumSize().height();
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x = x + item->minimumSize().width() + spaceX;
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}
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minWidth = qMax(minWidth, x);
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QSize size(minWidth - spaceX + right, y + lineHeight - rect.y() + bottom);
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return size;
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}
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int FeatureLayout::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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return -1;
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} else if (parent->isWidgetType()) {
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QWidget *pw = static_cast<QWidget *>(parent);
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return pw->style()->pixelMetric(pm, nullptr, pw);
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} else {
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return static_cast<QLayout *>(parent)->spacing();
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}
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}
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