From 39236c01ae6c9bc99ee3a02d8294679e12d9b734 Mon Sep 17 00:00:00 2001 From: Oswald Buddenhagen Date: Mon, 22 May 2017 16:44:51 +0200 Subject: move everying into sources/pyside2 in preparation for a subtree merge. this should not be necessary to do in a separate commit, but git is a tad stupid about following history correctly without it. --- .../doc/src/snippets/modelview-subclasses/view.cpp | 324 +++++++++++++++++++++ 1 file changed, 324 insertions(+) create mode 100644 sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp (limited to 'sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp') diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp new file mode 100644 index 000000000..a2a341bcb --- /dev/null +++ b/sources/pyside2/doc/codesnippets/doc/src/snippets/modelview-subclasses/view.cpp @@ -0,0 +1,324 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the examples of PySide2. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + view.cpp + + Provides a view to represent a one-dimensional sequence of integers + obtained from a list model as a series of rows. +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "view.h" + +LinearView::LinearView(QWidget *parent) + : QAbstractItemView(parent) +{ + setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed); +} + +/*! + Returns the position of the item in viewport coordinates. +*/ + +QRect LinearView::itemViewportRect(const QModelIndex &index) const +{ + QRect rect = itemRect(index); + QRect result(rect.left() - horizontalScrollBar()->value(), + rect.top() - verticalScrollBar()->value(), + rect.width(), viewport()->height()); + + return result; +} + +/*! + Returns the rectangle of the item at position \a index in the + model. The rectangle is in contents coordinates. +*/ + +QRect LinearView::itemRect(const QModelIndex &index) const +{ + if (!index.isValid()) + return QRect(); + else + return QRect(index.row(), 0, 1, 1); +} + + +void LinearView::ensureVisible(const QModelIndex &index) +{ + QRect area = viewport()->rect(); + QRect rect = itemViewportRect(index); + + if (rect.left() < area.left()) + horizontalScrollBar()->setValue( + horizontalScrollBar()->value() - rect.left()); + else if (rect.right() > area.right()) + horizontalScrollBar()->setValue( + horizontalScrollBar()->value() + rect.left() - area.width()); +} + +/*! + Returns the item that covers the coordinate given in the view. +*/ + +QModelIndex LinearView::itemAt(int x, int /* y */) const +{ + int row = x + horizontalScrollBar()->value(); + + return model()->index(row, 0, QModelIndex()); +} + +//void LinearView::dataChanged(const QModelIndex &/* topLeft */, +// const QModelIndex &/* bottomRight */) +//{ +// updateGeometries(); +// if (isVisible()) +// repaint(); +//} + +void LinearView::rowsInserted(const QModelIndex &/* parent */, int /* start */, + int /* end */) +{ + updateGeometries(); + if (isVisible()) + repaint(); +} + +void LinearView::rowsRemoved(const QModelIndex &/* parent */, int /* start */, + int /* end */) +{ + updateGeometries(); + if (isVisible()) + repaint(); +} +/* +void LinearView::verticalScrollbarAction(int action) +{ +} + +void LinearView::horizontalScrollbarAction(int action) +{ +} +*/ + +/*! + Select the items in the model that lie within the rectangle specified by + \a rect, using the selection \a command. +*/ + +void LinearView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command) +{ + QModelIndex leftIndex = itemAt(rect.left(), 0); + QModelIndex rightIndex = itemAt(rect.right(), 0); + + QItemSelection selection(leftIndex, rightIndex); + + selectionModel()->select(selection, command); +} + +QModelIndex LinearView::moveCursor(QAbstractItemView::CursorAction cursorAction, + Qt::KeyboardModifiers) +{ + QModelIndex current = currentIndex(); + + switch (cursorAction) { + case MoveLeft:{ + if (current.row() > 0) + return model()->index(current.row() - 1, 0, QModelIndex()); + else + return model()->index(0, 0, QModelIndex()); + break;} + case MoveRight:{ + if (current.row() < rows(current) - 1) + return model()->index(current.row() + 1, 0, QModelIndex()); + else + return model()->index(rows(current) - 1, 0,QModelIndex()); + break;} + case MoveUp: + return current; + case MoveDown: + return current; + case MovePageUp: + return current; + case MovePageDown: + return current; + case MoveHome: + return model()->index(0, 0, QModelIndex()); + case MoveEnd: + return model()->index(rows(current) - 1, 0, QModelIndex()); + default: + return current; + } +} + +int LinearView::horizontalOffset() const +{ + return horizontalScrollBar()->value(); +} + +int LinearView::verticalOffset() const +{ + return verticalScrollBar()->value(); +} + +/*! + Returns a rectangle corresponding to the selection in viewport cooridinates. +*/ + +QRect LinearView::selectionViewportRect(const QItemSelection &selection) const +{ + int ranges = selection.count(); + + if (ranges == 0) + return QRect(); + + // Note that we use the top and bottom functions of the selection range + // since the data is stored in rows. + + int firstRow = selection.at(0).top(); + int lastRow = selection.at(0).top(); + + for (int i = 0; i < ranges; ++i) { + firstRow = qMin(firstRow, selection.at(i).top()); + lastRow = qMax(lastRow, selection.at(i).bottom()); + } + + QModelIndex firstItem = model()->index(qMin(firstRow, lastRow), 0, + QModelIndex()); + QModelIndex lastItem = model()->index(qMax(firstRow, lastRow), 0, + QModelIndex()); + + QRect firstRect = itemViewportRect(firstItem); + QRect lastRect = itemViewportRect(lastItem); + + return QRect(firstRect.left(), firstRect.top(), + lastRect.right() - firstRect.left(), firstRect.height()); +} + +void LinearView::paintEvent(QPaintEvent *event) +{ + QPainter painter(viewport()); + + QRect updateRect = event->rect(); + QBrush background(Qt::black); + QPen foreground(Qt::white); + + painter.fillRect(updateRect, background); + painter.setPen(foreground); + + QModelIndex firstItem = itemAt(updateRect.left(), updateRect.top()); + if (!firstItem.isValid()) + firstItem = model()->index(0, 0, QModelIndex()); + + QModelIndex lastItem = itemAt(updateRect.right(), updateRect.bottom()); + if (!lastItem.isValid()) + lastItem = model()->index(rows() - 1, 0, QModelIndex()); + + int x = updateRect.left(); + //int top = updateRect.top(); + //int bottom = updateRect.bottom(); + + int row = firstItem.row(); + QModelIndex index = model()->index(row, 0, QModelIndex()); + int value = model()->data(index, Qt::DisplayRole).toInt(); + int midPoint = viewport()->height()/2; + int y2 = midPoint - int(value * midPoint/255.0); + + while (row <= lastItem.row()) { + + QModelIndex index = model()->index(row, 0, QModelIndex()); + int value = model()->data(index, Qt::DisplayRole).toInt(); + + int y1 = y2; + y2 = midPoint - int(value * midPoint/255.0); + + painter.drawLine(x-1, y1, x, y2); + ++row; ++x; + } +} + +void LinearView::resizeEvent(QResizeEvent * /* event */) +{ + updateGeometries(); +} + +void LinearView::updateGeometries() +{ + if (viewport()->width() < rows()) { + horizontalScrollBar()->setPageStep(viewport()->width()); + horizontalScrollBar()->setRange(0, rows() - viewport()->width() - 1); + } +} + +QSize LinearView::sizeHint() const +{ + return QSize(rows(), 200); +} + +int LinearView::rows(const QModelIndex &index) const +{ + return model()->rowCount(model()->parent(index)); +} + +bool LinearView::isIndexHidden(const QModelIndex &index) const +{ + return false; +} -- cgit v1.2.3