This class can be used to loop over a number of widgets and then do a relayout to align

columns of all the different visited widgets.  In line with the KDE HIG

svn path=/trunk/koffice/; revision=649865

libs/kofficeui/CMakeLists.txt

@@ -49,6 +49,7 @@ set(kofficeui_LIB_SRCS
    KoShapeSelectorFactory.cpp
     KoToolDocker.cpp
     KoToolDockerFactory.cpp
+    KoLayoutVisitor.cpp
 )
 
 kde4_automoc(${kofficeui_LIB_SRCS})

libs/kofficeui/KoLayoutVisitor.cpp

+/* This file is part of the KDE project
+ * Copyright (C) 2007 Thomas Zander <zander@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "KoLayoutVisitor.h"
+
+#include <QLabel>
+#include <QLinkedList>
+#include <QGridLayout>
+
+#include <KDebug>
+
+struct Item {
+    QLabel *label;
+    int x;
+};
+
+class KoLayoutVisitor::Private {
+public:
+
+    void addItem(const Item &item) {
+        QLinkedList<Item>::iterator iter = items.begin();
+        while(iter->x < item.x && iter != items.end())
+            iter++;
+        //iter--;
+        items.insert(iter, item);
+    }
+
+    QLinkedList<Item> items;
+};
+
+KoLayoutVisitor::KoLayoutVisitor()
+    :d( new Private())
+{
+}
+
+KoLayoutVisitor::~KoLayoutVisitor() {
+    delete d;
+}
+
+void KoLayoutVisitor::visit(QWidget *widget) {
+    //if(!widget->isVisible()) return;
+    QLabel *label = qobject_cast<QLabel*> (widget);
+    if(label && !label->text().isEmpty()) {
+        Item item;
+        item.label = label;
+        item.x = label->mapToGlobal(QPoint(0,0)).x();
+// QPoint pos = label->mapToGlobal(QPoint(0,0));
+// kDebug() << "Found label: " << label->text() << "  at " << pos << endl;
+        d->addItem(item);
+    }
+
+    QList<QWidget*> childList = widget->findChildren<QWidget*>();
+    foreach ( QWidget *w , childList ) {
+        // Ignore unless we have the direct parent
+        if(qobject_cast<QWidget *>(w->parent()) != widget) continue;
+        visit(w);
+    }
+}
+
+void KoLayoutVisitor::relayout() {
+    class Layouter {
+    public:
+        Layouter() : x(-20), right(0) {}
+        void add(const Item &item) {
+            //kDebug() << "relayout::add " << item.label->text() << endl;
+
+            QGridLayout *layout = 0;
+            foreach ( QGridLayout *l, item.label->parentWidget()->findChildren<QGridLayout*>()) {
+                if(l->indexOf(item.label) != -1) {
+                    layout = l;
+                    break;
+                }
+            }
+
+            if(layout == 0)
+                return;
+            if(qAbs(item.x - x) > 16) { // next column.
+                alterColumnWidth();
+                x = item.x + 8;
+                right = 0;
+            }
+
+            right = qMax(right, item.x + item.label->width());
+            if(! column.contains(layout))
+                column.insert(layout, item.label);
+
+            layout->setAlignment(item.label, Qt::AlignRight);
+            item.label->setAlignment(Qt::AlignRight);
+        }
+        void finish() {
+            alterColumnWidth();
+        }
+    private:
+        void alterColumnWidth() {
+            if(column.size() <= 1) { // no need to 'sync' 1 layout, or less.
+                column.clear();
+                return;
+            }
+
+            foreach(QGridLayout* layout, column.keys()) {
+                QLabel *label = column[layout];
+                //kDebug() << "altering 1 layout (" << label->text() << ")\n";
+                int index = layout->indexOf(label);
+                int row, column, rowSpan, columnSpan;
+                layout->getItemPosition(index, &row, &column, &rowSpan, &columnSpan);
+                if(columnSpan > 1)
+                    kWarning() << "Attention, colSpan for " << label->text() << " is " << columnSpan << endl;
+                layout->setColumnMinimumWidth(column, right -label->mapToGlobal(QPoint(0,0)).x());
+            }
+            column.clear();
+        }
+
+        int x, right;
+        QHash<QGridLayout*, QLabel*> column;
+    };
+
+    Layouter layouter;
+    foreach(Item item, d->items)
+        layouter.add(item);
+    layouter.finish();
+}

libs/kofficeui/KoLayoutVisitor.h

+/* This file is part of the KDE project
+ * Copyright (C) 2007 Thomas Zander <zander@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef KOLAYOUTVISITOR_H
+#define KOLAYOUTVISITOR_H
+
+#include <QWidget>
+
+#include <kofficeui_export.h>
+
+/**
+ * This class can be used to loop over a number of widgets and then do a relayout to align
+ * columns of all the different visited widgets.
+ */
+class KOFFICEUI_EXPORT KoLayoutVisitor {
+public:
+    KoLayoutVisitor();
+    ~KoLayoutVisitor();
+
+    void visit(QWidget *widget);
+
+    void relayout();
+
+private:
+    class Private;
+    Private * const d;
+};
+
+#endif