Theme Editor: Added line numbering in the text editor, thanks to some code from Nokia. Also made newly opened documents scroll to the top of the document after loading

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26683 a1c6a512-1295-4272-9138-f99709370657

utils/themeeditor/codeeditor.cpp

@@ -0,0 +1,143 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * This file has been copied from Nokia's Qt Examples, with minor modifications
+ * made available under the LGPL version 2.1, as the original file was licensed
+ *
+ ****************************************************************************
+ ****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "codeeditor.h"
+
+//![constructor]
+
+CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
+{
+    lineNumberArea = new LineNumberArea(this);
+
+    connect(this, SIGNAL(blockCountChanged(int)),
+            this, SLOT(updateLineNumberAreaWidth(int)));
+    connect(this, SIGNAL(updateRequest(QRect,int)),
+            this, SLOT(updateLineNumberArea(QRect,int)));
+
+    updateLineNumberAreaWidth(0);
+}
+
+//![constructor]
+
+//![extraAreaWidth]
+
+int CodeEditor::lineNumberAreaWidth()
+{
+    int digits = 1;
+    int max = qMax(1, blockCount());
+    while (max >= 10) {
+        max /= 10;
+        ++digits;
+    }
+
+    int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;
+
+    return space;
+}
+
+//![extraAreaWidth]
+
+//![slotUpdateExtraAreaWidth]
+
+void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
+{ 
+    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
+}
+
+//![slotUpdateExtraAreaWidth]
+
+//![slotUpdateRequest]
+
+void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
+{
+    if (dy)
+        lineNumberArea->scroll(0, dy);
+    else
+        lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
+
+    if (rect.contains(viewport()->rect()))
+        updateLineNumberAreaWidth(0);
+}
+
+//![slotUpdateRequest]
+
+//![resizeEvent]
+
+void CodeEditor::resizeEvent(QResizeEvent *e)
+{
+    QPlainTextEdit::resizeEvent(e);
+
+    QRect cr = contentsRect();
+    lineNumberArea->setGeometry(QRect(cr.left(), cr.top(),
+                                      lineNumberAreaWidth(), cr.height()));
+}
+
+//![resizeEvent]
+
+//![extraAreaPaintEvent_0]
+
+void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
+{
+    QPainter painter(lineNumberArea);
+    painter.fillRect(event->rect(), Qt::lightGray);
+
+//![extraAreaPaintEvent_0]
+
+//![extraAreaPaintEvent_1]
+    QTextBlock block = firstVisibleBlock();
+    int blockNumber = block.blockNumber();
+    int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
+    int bottom = top + (int) blockBoundingRect(block).height();
+//![extraAreaPaintEvent_1]
+
+//![extraAreaPaintEvent_2]
+    while (block.isValid() && top <= event->rect().bottom()) {
+        if (block.isVisible() && bottom >= event->rect().top()) {
+            QString number = QString::number(blockNumber + 1);
+            painter.setPen(Qt::black);
+            painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
+                             Qt::AlignRight, number);
+        }
+
+        block = block.next();
+        top = bottom;
+        bottom = top + (int) blockBoundingRect(block).height();
+        ++blockNumber;
+    }
+}
+//![extraAreaPaintEvent_2]
+

utils/themeeditor/codeeditor.h

@@ -0,0 +1,99 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * This file has been copied from Nokia's Qt Examples, with minor modifications
+ * made available under the LGPL version 2.1, as the original file was licensed
+ *
+ ****************************************************************************
+ ****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef CODEEDITOR_H
+#define CODEEDITOR_H
+
+#include <QPlainTextEdit>
+#include <QObject>
+
+QT_BEGIN_NAMESPACE
+class QPaintEvent;
+class QResizeEvent;
+class QSize;
+class QWidget;
+QT_END_NAMESPACE
+
+class LineNumberArea;
+
+//![codeeditordefinition]
+
+class CodeEditor : public QPlainTextEdit
+{
+    Q_OBJECT
+
+public:
+    CodeEditor(QWidget *parent = 0);
+
+    void lineNumberAreaPaintEvent(QPaintEvent *event);
+    int lineNumberAreaWidth();
+
+protected:
+    void resizeEvent(QResizeEvent *event);
+
+private slots:
+    void updateLineNumberAreaWidth(int newBlockCount);
+    void updateLineNumberArea(const QRect &, int);
+
+private:
+    QWidget *lineNumberArea;
+};
+
+//![codeeditordefinition]
+//![extraarea]
+
+class LineNumberArea : public QWidget
+{
+public:
+    LineNumberArea(CodeEditor *editor) : QWidget(editor) {
+        codeEditor = editor;
+    }
+
+    QSize sizeHint() const {
+        return QSize(codeEditor->lineNumberAreaWidth(), 0);
+    }
+
+protected:
+    void paintEvent(QPaintEvent *event) {
+        codeEditor->lineNumberAreaPaintEvent(event);
+    }
+
+private:
+    CodeEditor *codeEditor;
+};
+
+//![extraarea]
+
+#endif

utils/themeeditor/skindocument.cpp

@@ -52,6 +52,7 @@ SkinDocument::SkinDocument(QLabel* statusLabel, QString file, QWidget *parent):
         fin.open(QFile::ReadOnly);
         editor->document()->setPlainText(QString(fin.readAll()));
         saved = editor->document()->toPlainText();
+        editor->setTextCursor(QTextCursor(editor->document()->begin()));
         fin.close();
     }
 
@@ -113,7 +114,7 @@ void SkinDocument::setupUI()
 {
     /* Setting up the text edit */
     layout = new QHBoxLayout;
-    editor = new QPlainTextEdit(this);
+    editor = new CodeEditor(this);
     editor->setLineWrapMode(QPlainTextEdit::NoWrap);
     layout->addWidget(editor);
 

utils/themeeditor/skindocument.h

@@ -25,11 +25,11 @@
 #include <QWidget>
 #include <QLabel>
 #include <QHBoxLayout>
-#include <QPlainTextEdit>
 
 #include "skinhighlighter.h"
 #include "parsetreemodel.h"
 #include "preferencesdialog.h"
+#include "codeeditor.h"
 
 class SkinDocument : public QWidget
 {
@@ -81,7 +81,7 @@ private:
     QTextCharFormat errorColor;
 
     QLayout* layout;
-    QPlainTextEdit* editor;
+    CodeEditor* editor;
 
     SkinHighlighter* highlighter;
     ParseTreeModel* model;

utils/themeeditor/themeeditor.pro

@@ -14,7 +14,8 @@ HEADERS += tag_table.h \
     editorwindow.h \
     skinhighlighter.h \
     skindocument.h \
-    preferencesdialog.h
+    preferencesdialog.h \
+    codeeditor.h
 SOURCES += tag_table.c \
     skin_parser.c \
     skin_scan.c \
@@ -25,7 +26,8 @@ SOURCES += tag_table.c \
     editorwindow.cpp \
     skinhighlighter.cpp \
     skindocument.cpp \
-    preferencesdialog.cpp
+    preferencesdialog.cpp \
+    codeeditor.cpp
 OTHER_FILES += README \
     resources/windowicon.png \
     resources/appicon.xcf \