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Commit b81d3fbb authored by Jan Blackquill's avatar Jan Blackquill 🌈 Committed by Jan Blackquill
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KItemListViewLayouter: handle grid view layouts in RtL properly

parent f8f97f05
Pipeline #125997 passed with stage
in 3 minutes and 49 seconds
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src/kitemviews/private/kitemlistviewlayouter.cpp
View file @ b81d3fbb
......@@ -9,6 +9,9 @@
#include "kitemlistsizehintresolver.h"
#include "kitemviews/kitemmodelbase.h"
#include <QGuiApplication>
#include <QScopeGuard>
// #define KITEMLISTVIEWLAYOUTER_DEBUG
KItemListViewLayouter::KItemListViewLayouter(KItemListSizeHintResolver* sizeHintResolver, QObject* parent) :
......@@ -343,170 +346,177 @@ void KItemListViewLayouter::markAsDirty()
void KItemListViewLayouter::doLayout()
{
if (m_dirty) {
// we always want to update visible indexes after performing a layout
auto qsg = qScopeGuard([this] { updateVisibleIndexes(); });
if (!m_dirty) {
return;
}
#ifdef KITEMLISTVIEWLAYOUTER_DEBUG
QElapsedTimer timer;
timer.start();
QElapsedTimer timer;
timer.start();
#endif
m_visibleIndexesDirty = true;
QSizeF itemSize = m_itemSize;
QSizeF itemMargin = m_itemMargin;
QSizeF size = m_size;
const bool grouped = createGroupHeaders();
const bool horizontalScrolling = (m_scrollOrientation == Qt::Horizontal);
if (horizontalScrolling) {
// Flip everything so that the layout logically can work like having
// a vertical scrolling
itemSize.transpose();
itemMargin.transpose();
size.transpose();
if (grouped) {
// In the horizontal scrolling case all groups are aligned
// at the top, which decreases the available height. For the
// flipped data this means that the width must be decreased.
size.rwidth() -= m_groupHeaderHeight;
}
m_visibleIndexesDirty = true;
QSizeF itemSize = m_itemSize;
QSizeF itemMargin = m_itemMargin;
QSizeF size = m_size;
const bool grouped = createGroupHeaders();
const bool horizontalScrolling = (m_scrollOrientation == Qt::Horizontal);
if (horizontalScrolling) {
// Flip everything so that the layout logically can work like having
// a vertical scrolling
itemSize.transpose();
itemMargin.transpose();
size.transpose();
if (grouped) {
// In the horizontal scrolling case all groups are aligned
// at the top, which decreases the available height. For the
// flipped data this means that the width must be decreased.
size.rwidth() -= m_groupHeaderHeight;
}
}
m_columnWidth = itemSize.width() + itemMargin.width();
const qreal widthForColumns = size.width() - itemMargin.width();
m_columnCount = qMax(1, int(widthForColumns / m_columnWidth));
m_xPosInc = itemMargin.width();
const int itemCount = m_model->count();
if (itemCount > m_columnCount && m_columnWidth >= 32) {
// Apply the unused width equally to each column
const qreal unusedWidth = widthForColumns - m_columnCount * m_columnWidth;
if (unusedWidth > 0) {
const qreal columnInc = unusedWidth / (m_columnCount + 1);
m_columnWidth += columnInc;
m_xPosInc += columnInc;
}
m_columnWidth = itemSize.width() + itemMargin.width();
const qreal widthForColumns = size.width() - itemMargin.width();
m_columnCount = qMax(1, int(widthForColumns / m_columnWidth));
m_xPosInc = itemMargin.width();
const int itemCount = m_model->count();
if (itemCount > m_columnCount && m_columnWidth >= 32) {
// Apply the unused width equally to each column
const qreal unusedWidth = widthForColumns - m_columnCount * m_columnWidth;
if (unusedWidth > 0) {
const qreal columnInc = unusedWidth / (m_columnCount + 1);
m_columnWidth += columnInc;
m_xPosInc += columnInc;
}
}
m_itemInfos.resize(itemCount);
m_itemInfos.resize(itemCount);
// Calculate the offset of each column, i.e., the x-coordinate where the column starts.
m_columnOffsets.resize(m_columnCount);
qreal currentOffset = m_xPosInc;
// Calculate the offset of each column, i.e., the x-coordinate where the column starts.
m_columnOffsets.resize(m_columnCount);
qreal currentOffset = QGuiApplication::isRightToLeft() ? widthForColumns : m_xPosInc;
if (grouped && horizontalScrolling) {
// All group headers will always be aligned on the top and not
// flipped like the other properties.
currentOffset += m_groupHeaderHeight;
}
if (grouped && horizontalScrolling) {
// All group headers will always be aligned on the top and not
// flipped like the other properties.
currentOffset += m_groupHeaderHeight;
}
for (int column = 0; column < m_columnCount; ++column) {
m_columnOffsets[column] = currentOffset;
currentOffset += m_columnWidth;
}
if (QGuiApplication::isLeftToRight()) for (int column = 0; column < m_columnCount; ++column) {
m_columnOffsets[column] = currentOffset;
currentOffset += m_columnWidth;
}
else for (int column = 0; column < m_columnCount; ++column) {
m_columnOffsets[column] = currentOffset - m_columnWidth;
currentOffset -= m_columnWidth;
}
// Prepare the QVector which stores the y-coordinate for each new row.
int numberOfRows = (itemCount + m_columnCount - 1) / m_columnCount;
if (grouped && m_columnCount > 1) {
// In the worst case, a new row will be started for every group.
// We could calculate the exact number of rows now to prevent that we reserve
// too much memory, but the code required to do that might need much more
// memory than it would save in the average case.
numberOfRows += m_groupItemIndexes.count();
}
m_rowOffsets.resize(numberOfRows);
qreal y = m_headerHeight + itemMargin.height();
int row = 0;
int index = 0;
while (index < itemCount) {
qreal maxItemHeight = itemSize.height();
if (grouped) {
if (m_groupItemIndexes.contains(index)) {
// The item is the first item of a group.
// Increase the y-position to provide space
// for the group header.
if (index > 0) {
// Only add a margin if there has been added another
// group already before
y += m_groupHeaderMargin;
} else if (!horizontalScrolling) {
// The first group header should be aligned on top
y -= itemMargin.height();
}
if (!horizontalScrolling) {
y += m_groupHeaderHeight;
}
// Prepare the QVector which stores the y-coordinate for each new row.
int numberOfRows = (itemCount + m_columnCount - 1) / m_columnCount;
if (grouped && m_columnCount > 1) {
// In the worst case, a new row will be started for every group.
// We could calculate the exact number of rows now to prevent that we reserve
// too much memory, but the code required to do that might need much more
// memory than it would save in the average case.
numberOfRows += m_groupItemIndexes.count();
}
m_rowOffsets.resize(numberOfRows);
qreal y = m_headerHeight + itemMargin.height();
int row = 0;
int index = 0;
while (index < itemCount) {
qreal maxItemHeight = itemSize.height();
if (grouped) {
if (m_groupItemIndexes.contains(index)) {
// The item is the first item of a group.
// Increase the y-position to provide space
// for the group header.
if (index > 0) {
// Only add a margin if there has been added another
// group already before
y += m_groupHeaderMargin;
} else if (!horizontalScrolling) {
// The first group header should be aligned on top
y -= itemMargin.height();
}
}
m_rowOffsets[row] = y;
int column = 0;
while (index < itemCount && column < m_columnCount) {
qreal requiredItemHeight = itemSize.height();
const QSizeF sizeHint = m_sizeHintResolver->sizeHint(index);
const qreal sizeHintHeight = sizeHint.height();
if (sizeHintHeight > requiredItemHeight) {
requiredItemHeight = sizeHintHeight;
if (!horizontalScrolling) {
y += m_groupHeaderHeight;
}
}
}
ItemInfo& itemInfo = m_itemInfos[index];
itemInfo.column = column;
itemInfo.row = row;
if (grouped && horizontalScrolling) {
// When grouping is enabled in the horizontal mode, the header alignment
// looks like this:
// Header-1 Header-2 Header-3
// Item 1 Item 4 Item 7
// Item 2 Item 5 Item 8
// Item 3 Item 6 Item 9
// In this case 'requiredItemHeight' represents the column-width. We don't
// check the content of the header in the layouter to determine the required
// width, hence assure that at least a minimal width of 15 characters is given
// (in average a character requires the halve width of the font height).
//
// TODO: Let the group headers provide a minimum width and respect this width here
const qreal headerWidth = minimumGroupHeaderWidth();
if (requiredItemHeight < headerWidth) {
requiredItemHeight = headerWidth;
}
}
m_rowOffsets[row] = y;
maxItemHeight = qMax(maxItemHeight, requiredItemHeight);
++index;
++column;
int column = 0;
while (index < itemCount && column < m_columnCount) {
qreal requiredItemHeight = itemSize.height();
const QSizeF sizeHint = m_sizeHintResolver->sizeHint(index);
const qreal sizeHintHeight = sizeHint.height();
if (sizeHintHeight > requiredItemHeight) {
requiredItemHeight = sizeHintHeight;
}
if (grouped && m_groupItemIndexes.contains(index)) {
// The item represents the first index of a group
// and must aligned in the first column
break;
ItemInfo& itemInfo = m_itemInfos[index];
itemInfo.column = column;
itemInfo.row = row;
if (grouped && horizontalScrolling) {
// When grouping is enabled in the horizontal mode, the header alignment
// looks like this:
// Header-1 Header-2 Header-3
// Item 1 Item 4 Item 7
// Item 2 Item 5 Item 8
// Item 3 Item 6 Item 9
// In this case 'requiredItemHeight' represents the column-width. We don't
// check the content of the header in the layouter to determine the required
// width, hence assure that at least a minimal width of 15 characters is given
// (in average a character requires the halve width of the font height).
//
// TODO: Let the group headers provide a minimum width and respect this width here
const qreal headerWidth = minimumGroupHeaderWidth();
if (requiredItemHeight < headerWidth) {
requiredItemHeight = headerWidth;
}
}
y += maxItemHeight + itemMargin.height();
++row;
}
maxItemHeight = qMax(maxItemHeight, requiredItemHeight);
++index;
++column;
if (itemCount > 0) {
m_maximumScrollOffset = y;
m_maximumItemOffset = m_columnCount * m_columnWidth;
} else {
m_maximumScrollOffset = 0;
m_maximumItemOffset = 0;
if (grouped && m_groupItemIndexes.contains(index)) {
// The item represents the first index of a group
// and must aligned in the first column
break;
}
}
#ifdef KITEMLISTVIEWLAYOUTER_DEBUG
qCDebug(DolphinDebug) << "[TIME] doLayout() for " << m_model->count() << "items:" << timer.elapsed();
#endif
m_dirty = false;
y += maxItemHeight + itemMargin.height();
++row;
}
updateVisibleIndexes();
if (itemCount > 0) {
m_maximumScrollOffset = y;
m_maximumItemOffset = m_columnCount * m_columnWidth;
} else {
m_maximumScrollOffset = 0;
m_maximumItemOffset = 0;
}
#ifdef KITEMLISTVIEWLAYOUTER_DEBUG
qCDebug(DolphinDebug) << "[TIME] doLayout() for " << m_model->count() << "items:" << timer.elapsed();
#endif
m_dirty = false;
}
void KItemListViewLayouter::updateVisibleIndexes()
......
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