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FlowLayout: Add support for vertically expanding widgets and vertical alignment.

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This commit is contained in:
Jon Beniston 2022-09-16 08:50:21 +01:00
parent 880fde3480
commit 19fa10d71d
1 changed files with 45 additions and 29 deletions
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74
sdrgui/gui/flowlayout.cpp
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@ -51,7 +51,7 @@
#include <QtWidgets>
#include "flowlayout.h"
//! [1]
FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
: QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
{
@ -63,25 +63,19 @@ FlowLayout::FlowLayout(int margin, int hSpacing, int 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) {
@ -99,9 +93,7 @@ int FlowLayout::verticalSpacing() const
return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
}
}
//! [4]
//! [5]
int FlowLayout::count() const
{
return itemList.size();
@ -118,16 +110,12 @@ QLayoutItem *FlowLayout::takeAt(int index)
return itemList.takeAt(index);
return nullptr;
}
//! [5]
//! [6]
Qt::Orientations FlowLayout::expandingDirections() const
{
return { };
}
//! [6]
//! [7]
bool FlowLayout::hasHeightForWidth() const
{
return true;
@ -138,9 +126,7 @@ 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);
@ -162,9 +148,7 @@ QSize FlowLayout::minimumSize() const
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;
@ -173,39 +157,72 @@ int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
int x = effectiveRect.x();
int y = effectiveRect.y();
int lineHeight = 0;
//! [9]
QList<int> maxLineHeights;
int maxLineHeight = 0;
//! [10]
// In order to support vertical alignment and expanding widgets, we need to first calculate maxLineHeight
// for each row of widgets
if (!testOnly) {
for (QLayoutItem *item : qAsConst(itemList)) {
const QWidget *wid = item->widget();
int spaceX = horizontalSpacing();
if (spaceX == -1)
spaceX = wid->style()->layoutSpacing(QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
int nextX = x + item->sizeHint().width() + spaceX;
if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
x = effectiveRect.x();
nextX = x + item->sizeHint().width() + spaceX;
maxLineHeights.append(lineHeight);
lineHeight = 0;
}
x = nextX;
lineHeight = qMax(lineHeight, item->sizeHint().height());
}
maxLineHeights.append(lineHeight);
maxLineHeight = maxLineHeights.takeFirst();
x = effectiveRect.x();
y = effectiveRect.y();
}
// Now do layout
for (QLayoutItem *item : qAsConst(itemList)) {
const QWidget *wid = item->widget();
int spaceX = horizontalSpacing();
if (spaceX == -1)
spaceX = wid->style()->layoutSpacing(
QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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]
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;
if (maxLineHeights.size() > 0) {
maxLineHeight = maxLineHeights.takeFirst();
}
lineHeight = 0;
}
if (!testOnly)
item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
{
QSize size = item->sizeHint();
if (wid && (wid->sizePolicy().verticalPolicy() != QSizePolicy::Fixed)) {
size.setHeight(maxLineHeight);
}
QRect r(QPoint(x, y), size);
item->setGeometry(r);
}
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();
@ -218,4 +235,3 @@ int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
return static_cast<QLayout *>(parent)->spacing();
}
}
//! [12]