Make the MultiMC delegate fully usable. Dynamic row heights.

CMakeLists.txt

@@ -29,6 +29,8 @@ set(SOURCES
  CategorizedView.cpp
  CategorizedProxyModel.h
  CategorizedProxyModel.cpp
+ InstanceDelegate.h
+ InstanceDelegate.cpp
 )
 
 add_executable(GroupView ${SOURCES})

CategorizedView.cpp

@@ -80,7 +80,22 @@ int CategorizedView::Category::contentHeight() const
 		return 0;
 	}
 	const int rows = qMax(1, qCeil((qreal)view->numItemsForCategory(this) / (qreal)view->itemsPerRow()));
-	return view->itemSize().height() * rows;
+	QMap<int, int> rowToHeightMapping;
+	foreach (const QModelIndex &index, view->itemsForCategory(this))
+	{
+		int row = view->categoryInternalPosition(index).second;
+		if (!rowToHeightMapping.contains(row))
+		{
+			rowToHeightMapping.insert(row, view->itemSize(index).height());
+		}
+	}
+	int result = 0;
+	for (int i = 0; i < rows; ++i)
+	{
+		Q_ASSERT(rowToHeightMapping.contains(i));
+		result += rowToHeightMapping[i];
+	}
+	return result;
 }
 QSize CategorizedView::Category::categoryTotalSize() const
 {
@@ -153,9 +168,10 @@ void CategorizedView::updateGeometries()
 {
 	QListView::updateGeometries();
 
-	m_cachedItemSize = QSize();
+	m_cachedItemWidth = -1;
 	m_cachedCategoryToIndexMapping.clear();
 	m_cachedVisualRects.clear();
+	m_cachedItemSizes.clear();
 
 	QMap<QString, Category *> cats;
 
@@ -323,24 +339,59 @@ QList<CategorizedView::Category *> CategorizedView::sortedCategories() const
 	return out;
 }
 
-QSize CategorizedView::itemSize(const QStyleOptionViewItem &option) const
+int CategorizedView::itemWidth() const
 {
-	if (!m_cachedItemSize.isValid())
+	if (m_cachedItemWidth == -1)
 	{
-		QModelIndex sample = model()->index(model()->rowCount() -1, 0);
+		m_cachedItemWidth = itemDelegate()->sizeHint(viewOptions(), model()->index(model()->rowCount() -1, 0)).width();
-		const QAbstractItemDelegate *delegate = itemDelegate();
-		if (delegate)
-		{
-			m_cachedItemSize = delegate->sizeHint(option, sample);
-			m_cachedItemSize.setWidth(m_cachedItemSize.width() + 20);
-			m_cachedItemSize.setHeight(m_cachedItemSize.height() + 20);
 	}
-		else
+	return m_cachedItemWidth;
+}
+
+QSize CategorizedView::itemSize(const QModelIndex &index) const
 {
-			m_cachedItemSize = QSize();
+	if (!m_cachedItemSizes.contains(index))
+	{
+		QModelIndexList indices;
+		int internalRow = categoryInternalPosition(index).second;
+		foreach (const QModelIndex &i, itemsForCategory(category(index)))
+		{
+			if (categoryInternalPosition(i).second == internalRow)
+			{
+				indices.append(i);
 			}
 		}
-	return m_cachedItemSize;
+
+		int largestHeight = 0;
+		foreach (const QModelIndex &i, indices)
+		{
+			largestHeight = qMax(largestHeight, itemDelegate()->sizeHint(viewOptions(), i).height());
+		}
+		m_cachedItemSizes.insert(index, new QSize(itemWidth(), largestHeight));
+	}
+	return *m_cachedItemSizes.object(index);
+}
+
+QPair<int, int> CategorizedView::categoryInternalPosition(const QModelIndex &index) const
+{
+	QList<QModelIndex> indices = itemsForCategory(category(index));
+	int x = 0;
+	int y = 0;
+	const int perRow = itemsPerRow();
+	for (int i = 0; i < indices.size(); ++i)
+	{
+		if (indices.at(i) == index)
+		{
+			break;
+		}
+		++x;
+		if (x == perRow)
+		{
+			x = 0;
+			++y;
+		}
+	}
+	return qMakePair(x, y);
 }
 
 void CategorizedView::mousePressEvent(QMouseEvent *event)
@@ -719,25 +770,11 @@ QRect CategorizedView::visualRect(const QModelIndex &index) const
 	if (!m_cachedVisualRects.contains(index))
 	{
 		const Category *cat = category(index);
-		QList<QModelIndex> indices = itemsForCategory(cat);
+		QPair<int, int> pos = categoryInternalPosition(index);
-		int x = 0;
+		int x = pos.first;
-		int y = 0;
+		int y = pos.second;
-		const int perRow = itemsPerRow();
-		for (int i = 0; i < indices.size(); ++i)
-		{
-			if (indices.at(i) == index)
-			{
-				break;
-			}
-			++x;
-			if (x == perRow)
-			{
-				x = 0;
-				++y;
-			}
-		}
 
-		QSize size = itemSize();
+		QSize size = itemSize(index);
 
 		QRect *out = new QRect;
 		out->setTop(categoryTop(cat) + cat->headerHeight() + 5 + y * size.height());
@@ -897,7 +934,7 @@ QPair<CategorizedView::Category *, int> CategorizedView::rowDropPos(const QPoint
 	// calculate the internal column
 	int internalColumn = -1;
 	{
-		const int itemWidth = itemSize().width();
+		const int itemWidth = this->itemWidth();
 		for (int i = 0, c = 0;
 			 i < contentWidth();
 			 i += itemWidth, ++c)
@@ -918,7 +955,8 @@ QPair<CategorizedView::Category *, int> CategorizedView::rowDropPos(const QPoint
 	// calculate the internal row
 	int internalRow = -1;
 	{
-		const int itemHeight = itemSize().height();
+		// FIXME rework the drag and drop code
+		const int itemHeight = 0; //itemSize().height();
 		const int top = categoryTop(category);
 		for (int i = top + category->headerHeight(), r = 0;
 			 i < top + category->totalHeight();

CategorizedView.h

@@ -91,9 +91,10 @@ private:
 	QList<Category *> sortedCategories() const;
 
 private:
-	mutable QSize m_cachedItemSize;
+	mutable int m_cachedItemWidth;
-	QSize itemSize(const QStyleOptionViewItem &option) const;
+	mutable QCache<QModelIndex, QSize> m_cachedItemSizes;
-	QSize itemSize() const { return itemSize(viewOptions()); }
+	int itemWidth() const;
+	QSize itemSize(const QModelIndex &index) const;
 
 	/*QLineEdit *m_categoryEditor;
 	Category *m_editedCategory;
@@ -110,6 +111,8 @@ private:
 	QItemSelectionModel::SelectionFlag m_ctrlDragSelectionFlag;
 	QPoint m_lastDragPosition;
 
+	QPair<int, int> categoryInternalPosition(const QModelIndex &index) const;
+
 	QPixmap renderToPixmap(const QModelIndexList &indices, QRect *r) const;
 	QList<QPair<QRect, QModelIndex> > draggablePaintPairs(const QModelIndexList &indices, QRect *r) const;
 

InstanceDelegate.cpp

@@ -0,0 +1,254 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "InstanceDelegate.h"
+#include <QPainter>
+#include <QTextOption>
+#include <QTextLayout>
+#include <QApplication>
+#include <QtCore/qmath.h>
+
+// Origin: Qt
+static void viewItemTextLayout(QTextLayout &textLayout, int lineWidth, qreal &height,
+							   qreal &widthUsed)
+{
+	height = 0;
+	widthUsed = 0;
+	textLayout.beginLayout();
+	QString str = textLayout.text();
+	while (true)
+	{
+		QTextLine line = textLayout.createLine();
+		if (!line.isValid())
+			break;
+		if (line.textLength() == 0)
+			break;
+		line.setLineWidth(lineWidth);
+		line.setPosition(QPointF(0, height));
+		height += line.height();
+		widthUsed = qMax(widthUsed, line.naturalTextWidth());
+	}
+	textLayout.endLayout();
+}
+
+#define QFIXED_MAX (INT_MAX / 256)
+
+ListViewDelegate::ListViewDelegate(QObject *parent) : QStyledItemDelegate(parent)
+{
+}
+
+void drawSelectionRect(QPainter *painter, const QStyleOptionViewItemV4 &option,
+					   const QRect &rect)
+{
+	if ((option.state & QStyle::State_Selected))
+		painter->fillRect(rect, option.palette.brush(QPalette::Highlight));
+	else
+	{
+		QColor backgroundColor = option.palette.color(QPalette::Background);
+		backgroundColor.setAlpha(160);
+		painter->fillRect(rect, QBrush(backgroundColor));
+	}
+}
+
+void drawFocusRect(QPainter *painter, const QStyleOptionViewItemV4 &option, const QRect &rect)
+{
+	if (!(option.state & QStyle::State_HasFocus))
+		return;
+	QStyleOptionFocusRect opt;
+	opt.direction = option.direction;
+	opt.fontMetrics = option.fontMetrics;
+	opt.palette = option.palette;
+	opt.rect = rect;
+	// opt.state           = option.state | QStyle::State_KeyboardFocusChange |
+	// QStyle::State_Item;
+	auto col = option.state & QStyle::State_Selected ? QPalette::Highlight : QPalette::Base;
+	opt.backgroundColor = option.palette.color(col);
+	// Apparently some widget styles expect this hint to not be set
+	painter->setRenderHint(QPainter::Antialiasing, false);
+
+	QStyle *style = option.widget ? option.widget->style() : QApplication::style();
+
+	style->drawPrimitive(QStyle::PE_FrameFocusRect, &opt, painter, option.widget);
+
+	painter->setRenderHint(QPainter::Antialiasing);
+}
+
+static QSize viewItemTextSize(const QStyleOptionViewItemV4 *option)
+{
+	QStyle *style = option->widget ? option->widget->style() : QApplication::style();
+	QTextOption textOption;
+	textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
+	QTextLayout textLayout;
+	textLayout.setTextOption(textOption);
+	textLayout.setFont(option->font);
+	textLayout.setText(option->text);
+	const int textMargin =
+		style->pixelMetric(QStyle::PM_FocusFrameHMargin, option, option->widget) + 1;
+	QRect bounds(0, 0, 100 - 2 * textMargin, 600);
+	qreal height = 0, widthUsed = 0;
+	viewItemTextLayout(textLayout, bounds.width(), height, widthUsed);
+	const QSize size(qCeil(widthUsed), qCeil(height));
+	return QSize(size.width() + 2 * textMargin, size.height());
+}
+
+void ListViewDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
+							 const QModelIndex &index) const
+{
+	QStyleOptionViewItemV4 opt = option;
+	initStyleOption(&opt, index);
+	painter->save();
+	painter->setClipRect(opt.rect);
+
+	opt.features |= QStyleOptionViewItem::WrapText;
+	opt.text = index.data().toString();
+	opt.textElideMode = Qt::ElideRight;
+	opt.displayAlignment = Qt::AlignTop | Qt::AlignHCenter;
+
+	QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
+
+	// const int iconSize =  style->pixelMetric(QStyle::PM_IconViewIconSize);
+	const int iconSize = 48;
+	QRect iconbox = opt.rect;
+	const int textMargin = style->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, opt.widget) + 1;
+	QRect textRect = opt.rect;
+	QRect textHighlightRect = textRect;
+	// clip the decoration on top, remove width padding
+	textRect.adjust(textMargin, iconSize + textMargin + 5, -textMargin, 0);
+
+	textHighlightRect.adjust(0, iconSize + 5, 0, 0);
+
+	// draw background
+	{
+		// FIXME: unused
+		// QSize textSize = viewItemTextSize ( &opt );
+		QPalette::ColorGroup cg;
+		QStyleOptionViewItemV4 opt2(opt);
+
+		if ((opt.widget && opt.widget->isEnabled()) || (opt.state & QStyle::State_Enabled))
+		{
+			if (!(opt.state & QStyle::State_Active))
+				cg = QPalette::Inactive;
+			else
+				cg = QPalette::Normal;
+		}
+		else
+		{
+			cg = QPalette::Disabled;
+		}
+		opt2.palette.setCurrentColorGroup(cg);
+
+		// fill in background, if any
+		if (opt.backgroundBrush.style() != Qt::NoBrush)
+		{
+			QPointF oldBO = painter->brushOrigin();
+			painter->setBrushOrigin(opt.rect.topLeft());
+			painter->fillRect(opt.rect, opt.backgroundBrush);
+			painter->setBrushOrigin(oldBO);
+		}
+
+		if (opt.showDecorationSelected)
+		{
+			drawSelectionRect(painter, opt2, opt.rect);
+			drawFocusRect(painter, opt2, opt.rect);
+			// painter->fillRect ( opt.rect, opt.palette.brush ( cg, QPalette::Highlight ) );
+		}
+		else
+		{
+
+			// if ( opt.state & QStyle::State_Selected )
+			{
+				// QRect textRect = subElementRect ( QStyle::SE_ItemViewItemText,  opt,
+				// opt.widget );
+				// painter->fillRect ( textHighlightRect, opt.palette.brush ( cg,
+				// QPalette::Highlight ) );
+				drawSelectionRect(painter, opt2, textHighlightRect);
+				drawFocusRect(painter, opt2, textHighlightRect);
+			}
+		}
+	}
+
+	// draw the icon
+	{
+		QIcon::Mode mode = QIcon::Normal;
+		if (!(opt.state & QStyle::State_Enabled))
+			mode = QIcon::Disabled;
+		else if (opt.state & QStyle::State_Selected)
+			mode = QIcon::Selected;
+		QIcon::State state = opt.state & QStyle::State_Open ? QIcon::On : QIcon::Off;
+
+		iconbox.setHeight(iconSize);
+		opt.icon.paint(painter, iconbox, Qt::AlignCenter, mode, state);
+	}
+	// set the text colors
+	QPalette::ColorGroup cg =
+		opt.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
+	if (cg == QPalette::Normal && !(opt.state & QStyle::State_Active))
+		cg = QPalette::Inactive;
+	if (opt.state & QStyle::State_Selected)
+	{
+		painter->setPen(opt.palette.color(cg, QPalette::HighlightedText));
+	}
+	else
+	{
+		painter->setPen(opt.palette.color(cg, QPalette::Text));
+	}
+
+	// draw the text
+	QTextOption textOption;
+	textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
+	textOption.setTextDirection(opt.direction);
+	textOption.setAlignment(QStyle::visualAlignment(opt.direction, opt.displayAlignment));
+	QTextLayout textLayout;
+	textLayout.setTextOption(textOption);
+	textLayout.setFont(opt.font);
+	textLayout.setText(opt.text);
+
+	qreal width, height;
+	viewItemTextLayout(textLayout, textRect.width(), height, width);
+
+	const int lineCount = textLayout.lineCount();
+
+	const QRect layoutRect = QStyle::alignedRect(
+		opt.direction, opt.displayAlignment, QSize(textRect.width(), int(height)), textRect);
+	const QPointF position = layoutRect.topLeft();
+	for (int i = 0; i < lineCount; ++i)
+	{
+		const QTextLine line = textLayout.lineAt(i);
+		line.draw(painter, position);
+	}
+
+	painter->restore();
+}
+
+QSize ListViewDelegate::sizeHint(const QStyleOptionViewItem &option,
+								 const QModelIndex &index) const
+{
+	QStyleOptionViewItemV4 opt = option;
+	initStyleOption(&opt, index);
+	opt.features |= QStyleOptionViewItem::WrapText;
+	opt.text = index.data().toString();
+	opt.textElideMode = Qt::ElideRight;
+	opt.displayAlignment = Qt::AlignTop | Qt::AlignHCenter;
+
+	QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
+	const int textMargin =
+		style->pixelMetric(QStyle::PM_FocusFrameHMargin, &option, opt.widget) + 1;
+	int height = 48 + textMargin * 2 + 5; // TODO: turn constants into variables
+	QSize szz = viewItemTextSize(&opt);
+	height += szz.height();
+	// FIXME: maybe the icon items could scale and keep proportions?
+	QSize sz(100, height);
+	return sz;
+}

InstanceDelegate.h

@@ -0,0 +1,27 @@
+/* Copyright 2013 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QStyledItemDelegate>
+
+class ListViewDelegate : public QStyledItemDelegate
+{
+public:
+	explicit ListViewDelegate ( QObject* parent = 0 );
+protected:
+	void paint ( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const;
+	QSize sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const;
+};

main.cpp

@@ -4,6 +4,7 @@
 #include <QPainter>
 
 #include "CategorizedProxyModel.h"
+#include "InstanceDelegate.h"
 
 QPixmap icon(const Qt::GlobalColor color)
 {
@@ -50,7 +51,7 @@ int main(int argc, char *argv[])
 	model.setRowCount(10);
 	model.setColumnCount(1);
 
-	model.setItem(0, createItem(Qt::red, "Red", "Colorful"));
+	model.setItem(0, createItem(Qt::red, "Red is a color. Some more text. I'm out of ideas. 42. What's your name?", "Colorful"));
 	model.setItem(1, createItem(Qt::blue, "Blue", "Colorful"));
 	model.setItem(2, createItem(Qt::yellow, "Yellow", "Colorful"));
 
@@ -72,6 +73,7 @@ int main(int argc, char *argv[])
 	pModel.setSourceModel(&model);
 
 	CategorizedView w;
+	w.setItemDelegate(new ListViewDelegate);
 	w.setModel(&pModel);
 	w.resize(640, 480);
 	w.show();