Add new HeaderBanner class for WebFlowCredentialsDialog

New widget on top of the layout, based on Qt's own modern wizard header banner.

This should improve the user's perception of the dialog.

Encapsulate the existing layout into a container layout to allow the banner taking
the full width of the dialog.

Signed-off-by: Michael Schuster <michael@schuster.ms>

1 files changed, 146 insertions, 0 deletions

diff --git a/src/gui/headerbanner.cpp b/src/gui/headerbanner.cpp
new file mode 100644
index 000000000..4c425750f
--- /dev/null
+++ b/src/gui/headerbanner.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) by Michael Schuster <michael@nextcloud.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+/****************************************************************************
+**
+** Based on Qt sourcecode:
+**   qt5/qtbase/src/widgets/dialogs/qwizard.cpp
+**
+** https://code.qt.io/cgit/qt/qtbase.git/tree/src/widgets/dialogs/qwizard.cpp?h=v5.13.0
+**
+** Original license:
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWidgets module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "headerbanner.h"
+
+#include <QVBoxLayout>
+#include <QLabel>
+
+#include <QPainter>
+#include <QStyle>
+#include <QGuiApplication>
+
+namespace OCC {
+
+// These fudge terms were needed a few places to obtain pixel-perfect results
+const int GapBetweenLogoAndRightEdge = 5;
+const int ModernHeaderTopMargin = 2;
+
+HeaderBanner::HeaderBanner(QWidget *parent)
+    : QWidget(parent)
+{
+    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+    setBackgroundRole(QPalette::Base);
+    titleLabel = new QLabel(this);
+    titleLabel->setBackgroundRole(QPalette::Base);
+    logoLabel = new QLabel(this);
+    QFont font = titleLabel->font();
+    font.setBold(true);
+    titleLabel->setFont(font);
+    layout = new QGridLayout(this);
+    layout->setContentsMargins(QMargins());
+    layout->setSpacing(0);
+    layout->setRowMinimumHeight(3, 1);
+    layout->setRowStretch(4, 1);
+    layout->setColumnStretch(2, 1);
+    layout->setColumnMinimumWidth(4, 2 * GapBetweenLogoAndRightEdge);
+    layout->setColumnMinimumWidth(6, GapBetweenLogoAndRightEdge);
+    layout->addWidget(titleLabel, 1, 1, 5, 1);
+    layout->addWidget(logoLabel, 1, 5, 5, 1);
+}
+
+void HeaderBanner::setup(const QString &title, const QPixmap &logo, const QPixmap &banner,
+                         const Qt::TextFormat titleFormat, const QString &styleSheet)
+{
+    QStyle *style = parentWidget()->style();
+    //const int layoutHorizontalSpacing = style->pixelMetric(QStyle::PM_LayoutHorizontalSpacing);
+    int topLevelMarginLeft = style->pixelMetric(QStyle::PM_LayoutLeftMargin, 0, parentWidget());
+    int topLevelMarginRight = style->pixelMetric(QStyle::PM_LayoutRightMargin, 0, parentWidget());
+    int topLevelMarginTop = style->pixelMetric(QStyle::PM_LayoutTopMargin, 0, parentWidget());
+    //int topLevelMarginBottom = style->pixelMetric(QStyle::PM_LayoutBottomMargin, 0, parentWidget());
+
+    layout->setRowMinimumHeight(0, ModernHeaderTopMargin);
+    layout->setRowMinimumHeight(1, topLevelMarginTop - ModernHeaderTopMargin - 1);
+    layout->setRowMinimumHeight(6, 3);
+    int minColumnWidth0 = topLevelMarginLeft + topLevelMarginRight;
+    int minColumnWidth1 = topLevelMarginLeft + topLevelMarginRight + 1;
+    layout->setColumnMinimumWidth(0, minColumnWidth0);
+    layout->setColumnMinimumWidth(1, minColumnWidth1);
+    titleLabel->setTextFormat(titleFormat);
+    titleLabel->setText(title);
+    if(!styleSheet.isEmpty())
+        titleLabel->setStyleSheet(styleSheet);
+    logoLabel->setPixmap(logo);
+    bannerPixmap = banner;
+    if (bannerPixmap.isNull()) {
+        QSize size = layout->totalMinimumSize();
+        setMinimumSize(size);
+        setMaximumSize(QWIDGETSIZE_MAX, size.height());
+    } else {
+        setFixedHeight(banner.height() + 2);
+    }
+    updateGeometry();
+}
+
+void HeaderBanner::paintEvent(QPaintEvent * /* event */)
+{
+    QPainter painter(this);
+    painter.drawPixmap(0, 0, width(), bannerPixmap.height(), bannerPixmap);
+    int x = width() - 2;
+    int y = height() - 2;
+    const QPalette &pal = QGuiApplication::palette();
+    painter.setPen(pal.mid().color());
+    painter.drawLine(0, y, x, y);
+    painter.setPen(pal.base().color());
+    painter.drawPoint(x + 1, y);
+    painter.drawLine(0, y + 1, x + 1, y + 1);
+}
+
+} // namespace OCC