diff options
Diffstat (limited to 'examples/widgets/layouts/flowlayout/flowlayout.py')
-rw-r--r-- | examples/widgets/layouts/flowlayout/flowlayout.py | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/examples/widgets/layouts/flowlayout/flowlayout.py b/examples/widgets/layouts/flowlayout/flowlayout.py new file mode 100644 index 000000000..8f4d41480 --- /dev/null +++ b/examples/widgets/layouts/flowlayout/flowlayout.py @@ -0,0 +1,160 @@ + +############################################################################ +## +## Copyright (C) 2013 Riverbank Computing Limited. +## Copyright (C) 2020 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the Qt for Python examples of the Qt Toolkit. +## +## $QT_BEGIN_LICENSE:BSD$ +## 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." +## +## $QT_END_LICENSE$ +## +############################################################################# + +"""PySide6 port of the widgets/layouts/flowlayout example from Qt v5.x""" + +import sys +from PySide6.QtCore import Qt, QMargins, QPoint, QRect, QSize +from PySide6.QtWidgets import (QApplication, QLayout, QPushButton, + QSizePolicy, QWidget) + + +class Window(QWidget): + def __init__(self): + super(Window, self).__init__() + + flowLayout = FlowLayout(self) + flowLayout.addWidget(QPushButton("Short")) + flowLayout.addWidget(QPushButton("Longer")) + flowLayout.addWidget(QPushButton("Different text")) + flowLayout.addWidget(QPushButton("More text")) + flowLayout.addWidget(QPushButton("Even longer button text")) + + self.setWindowTitle("Flow Layout") + + +class FlowLayout(QLayout): + def __init__(self, parent=None): + super(FlowLayout, self).__init__(parent) + + if parent is not None: + self.setContentsMargins(QMargins(0, 0, 0, 0)) + + self._item_list = [] + + def __del__(self): + item = self.takeAt(0) + while item: + item = self.takeAt(0) + + def addItem(self, item): + self._item_list.append(item) + + def count(self): + return len(self._item_list) + + def itemAt(self, index): + if index >= 0 and index < len(self._item_list): + return self._item_list[index] + + return None + + def takeAt(self, index): + if index >= 0 and index < len(self._item_list): + return self._item_list.pop(index) + + return None + + def expandingDirections(self): + return Qt.Orientations(Qt.Orientation(0)) + + def hasHeightForWidth(self): + return True + + def heightForWidth(self, width): + height = self._do_layout(QRect(0, 0, width, 0), True) + return height + + def setGeometry(self, rect): + super(FlowLayout, self).setGeometry(rect) + self._do_layout(rect, False) + + def sizeHint(self): + return self.minimumSize() + + def minimumSize(self): + size = QSize() + + for item in self._item_list: + size = size.expandedTo(item.minimumSize()) + + size += QSize(2 * self.contentsMargins().top(), + 2 * self.contentsMargins().top()) + return size + + def _do_layout(self, rect, test_only): + x = rect.x() + y = rect.y() + line_height = 0 + spacing = self.spacing() + + for item in self._item_list: + style = item.widget().style() + layout_spacing_x = style.layoutSpacing(QSizePolicy.PushButton, + QSizePolicy.PushButton, + Qt.Horizontal) + layout_spacing_y = style.layoutSpacing(QSizePolicy.PushButton, + QSizePolicy.PushButton, + Qt.Vertical) + space_x = spacing + layout_spacing_x + space_y = spacing + layout_spacing_y + next_x = x + item.sizeHint().width() + space_x + if next_x - space_x > rect.right() and line_height > 0: + x = rect.x() + y = y + line_height + space_y + next_x = x + item.sizeHint().width() + space_x + line_height = 0 + + if not test_only: + item.setGeometry(QRect(QPoint(x, y), item.sizeHint())) + + x = next_x + line_height = max(line_height, item.sizeHint().height()) + + return y + line_height - rect.y() + + +if __name__ == '__main__': + app = QApplication(sys.argv) + mainWin = Window() + mainWin.show() + sys.exit(app.exec_()) |