sdrangel/sdrgui/gui/featurelayout.cpp

317 wiersze
9.8 KiB
C++

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