|
|
@@ -0,0 +1,232 @@
|
|
|
+/****************************************************************************
|
|
|
+**
|
|
|
+** Copyright (C) 2016 The Qt Company Ltd.
|
|
|
+** Contact: https://www.qt.io/licensing/
|
|
|
+**
|
|
|
+** This file is part of the examples of the Qt Toolkit.
|
|
|
+**
|
|
|
+** $QT_BEGIN_LICENSE:BSD$
|
|
|
+** 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."
|
|
|
+**
|
|
|
+** $QT_END_LICENSE$
|
|
|
+**
|
|
|
+****************************************************************************/
|
|
|
+
|
|
|
+#include <QtWidgets>
|
|
|
+
|
|
|
+#include "flowlayout.h"
|
|
|
+//! [1]
|
|
|
+FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
|
|
|
+ : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
|
|
|
+{
|
|
|
+ setContentsMargins(margin, margin, margin, margin);
|
|
|
+}
|
|
|
+
|
|
|
+FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
|
|
|
+ : m_hSpace(hSpacing), m_vSpace(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) {
|
|
|
+ return m_hSpace;
|
|
|
+ } else {
|
|
|
+ return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+int FlowLayout::verticalSpacing() const
|
|
|
+{
|
|
|
+ if (m_vSpace >= 0) {
|
|
|
+ return m_vSpace;
|
|
|
+ } else {
|
|
|
+ return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
|
|
|
+ }
|
|
|
+}
|
|
|
+//! [4]
|
|
|
+
|
|
|
+//! [5]
|
|
|
+int FlowLayout::count() const
|
|
|
+{
|
|
|
+ return itemList.size();
|
|
|
+}
|
|
|
+
|
|
|
+QLayoutItem *FlowLayout::itemAt(int index) const
|
|
|
+{
|
|
|
+ return itemList.value(index);
|
|
|
+}
|
|
|
+
|
|
|
+QLayoutItem *FlowLayout::takeAt(int index)
|
|
|
+{
|
|
|
+ if (index >= 0 && index < itemList.size())
|
|
|
+ return itemList.takeAt(index);
|
|
|
+ else
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+//! [5]
|
|
|
+
|
|
|
+//! [6]
|
|
|
+Qt::Orientations FlowLayout::expandingDirections() const
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+//! [6]
|
|
|
+
|
|
|
+//! [7]
|
|
|
+bool FlowLayout::hasHeightForWidth() const
|
|
|
+{
|
|
|
+ return true;
|
|
|
+}
|
|
|
+
|
|
|
+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);
|
|
|
+ doLayout(rect, false);
|
|
|
+}
|
|
|
+
|
|
|
+QSize FlowLayout::sizeHint() const
|
|
|
+{
|
|
|
+ return minimumSize();
|
|
|
+}
|
|
|
+
|
|
|
+QSize FlowLayout::minimumSize() const
|
|
|
+{
|
|
|
+ QSize size;
|
|
|
+ QLayoutItem *item;
|
|
|
+ foreach (item, itemList)
|
|
|
+ size = size.expandedTo(item->minimumSize());
|
|
|
+
|
|
|
+ size += QSize(2*margin(), 2*margin());
|
|
|
+ return size;
|
|
|
+}
|
|
|
+//! [8]
|
|
|
+
|
|
|
+/**
|
|
|
+ * @brief 布局item
|
|
|
+ *
|
|
|
+ * @param rect
|
|
|
+ * @param testOnly
|
|
|
+ * @return int
|
|
|
+ */
|
|
|
+int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
|
|
|
+{
|
|
|
+ int left, top, right, bottom;
|
|
|
+ /* 获取布局的margins */
|
|
|
+ getContentsMargins(&left, &top, &right, &bottom);
|
|
|
+ QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
|
|
|
+ int x = effectiveRect.x();
|
|
|
+ int y = effectiveRect.y();
|
|
|
+ int lineHeight = 0;
|
|
|
+//! [9]
|
|
|
+
|
|
|
+//! [10]
|
|
|
+ /* 挨个排列组件，如果被隐藏了，那么也去掉前面的spacing距离 */
|
|
|
+ QLayoutItem *item;
|
|
|
+ foreach (item, itemList)
|
|
|
+ {
|
|
|
+ QWidget *wid = item->widget();
|
|
|
+ int spaceX = horizontalSpacing();
|
|
|
+ if (spaceX == -1)
|
|
|
+ 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]
|
|
|
+ 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;
|
|
|
+ lineHeight = 0;
|
|
|
+ }
|
|
|
+ /* 不是test就设置位置 */
|
|
|
+ if (!testOnly)
|
|
|
+ item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
|
|
|
+
|
|
|
+ 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();
|
|
|
+ if (!parent) {
|
|
|
+ return -1;
|
|
|
+ } else if (parent->isWidgetType()) {
|
|
|
+ QWidget *pw = static_cast<QWidget *>(parent);
|
|
|
+ return pw->style()->pixelMetric(pm, 0, pw);
|
|
|
+ } else {
|
|
|
+ return static_cast<QLayout *>(parent)->spacing();
|
|
|
+ }
|
|
|
+}
|
|
|
+//! [12]
|
