TitleBlockPropertiesWidget: moved the table used for custom variables into a new DiagramContextWidget class.

git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@1887 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/diagramcontextwidget.cpp

@@ -0,0 +1,173 @@
+#include "diagramcontextwidget.h"
+#include <QHeaderView>
+#include <QLabel>
+#include <QTableWidget>
+#include <QVBoxLayout>
+
+/**
+	Constructor
+	@param parent Parent QWidget
+*/
+DiagramContextWidget::DiagramContextWidget(QWidget *parent) :
+	QWidget(parent)
+{
+	initWidgets();
+	initLayout();
+}
+
+/**
+	Destructor
+*/
+DiagramContextWidget::~DiagramContextWidget() {
+}
+
+/**
+	@return Whether this widget is read-only.
+*/
+bool DiagramContextWidget::isReadOnly() {
+	return(table_ -> isEnabled());
+}
+
+/**
+	@return the DiagramContext object edited by this widget.
+*/
+DiagramContext DiagramContextWidget::context() const {
+	DiagramContext context;
+	for (int i = 0 ; i < table_ -> rowCount() ; ++ i) {
+		QTableWidgetItem *qtwi_name  = table_ -> item(i, 0);
+		QTableWidgetItem *qtwi_value = table_ -> item(i, 1);
+		if (!qtwi_name || !qtwi_value) continue;
+		
+		QString key = qtwi_name -> text();
+		if (key.isEmpty()) continue;
+		
+		QString value = qtwi_value -> text();
+		context.addValue(key, value);
+	}
+	return(context);
+}
+
+/**
+	Load the content from \a context into this widget.
+*/
+void DiagramContextWidget::setContext(const DiagramContext &context) {
+	clear();
+	int i = 0;
+	foreach (QString key, context.keys(DiagramContext::Alphabetical)) {
+		table_ -> setItem(i, 0, new QTableWidgetItem(key));
+		table_ -> setItem(i, 1, new QTableWidgetItem(context[key].toString()));
+		++ i;
+	}
+	checkTableRows();
+}
+
+/**
+	@return The count of name-less rows in the table.
+*/
+int DiagramContextWidget::nameLessRowsCount() const {
+	int name_less_rows_count = 0;
+	for (int i = 0 ; i < table_ -> rowCount() ; ++ i) {
+		QTableWidgetItem *qtwi_name  = table_ -> item(i, 0);
+		if (qtwi_name && qtwi_name -> text().isEmpty()) ++ name_less_rows_count;
+	}
+	return(name_less_rows_count);
+}
+
+/**
+	@param ro Whether this widget should be read-only.
+*/
+void DiagramContextWidget::setReadOnly(bool ro) {
+	table_ -> setEnabled(!ro);
+}
+
+/**
+	Clear any value entered within this widget.
+*/
+void DiagramContextWidget::clear() {
+	table_ -> clearContents();
+	for (int i = 1 ; i < table_ -> rowCount() ; ++ i) {
+		table_ -> removeRow(i);
+	}
+	refreshFormatLabel();
+}
+
+
+/**
+	Highlight keys that would not be accepted by a DiagramContext object.
+	@return the number of highlighted keys.
+*/
+int DiagramContextWidget::highlightNonAcceptableKeys() {
+	static QRegExp re(DiagramContext::validKeyRegExp());
+	
+	QBrush fg_brush = table_ -> palette().brush(QPalette::WindowText);
+	
+	int invalid_keys = 0;
+	for (int i = 0 ; i < table_ -> rowCount() ; ++ i) {
+		QTableWidgetItem *qtwi_name  = table_ -> item(i, 0);
+		if (!qtwi_name) continue;
+		bool highlight = false;
+		if (!qtwi_name -> text().isEmpty()) {
+			if (!re.exactMatch(qtwi_name -> text())) {
+				highlight = true;
+				++ invalid_keys;
+			}
+		}
+		qtwi_name -> setForeground(highlight ? Qt::red : fg_brush);
+	}
+	return(invalid_keys);
+}
+
+/**
+	Sets the text describing the acceptable format for keys when adding extra
+	key/value pairs.
+*/
+void DiagramContextWidget::refreshFormatLabel() {
+	QString format_text = tr(
+		"Les noms ne peuvent contenir que des lettres minuscules, des "
+		"chiffres et des tirets."
+	);
+	
+	if (highlightNonAcceptableKeys()) {
+		format_text = QString("<span style=\"color: red;\">%1</span>").arg(format_text);
+	}
+	format_label -> setText(format_text);
+}
+
+/**
+	Adds a row in the additional fields table if needed.
+*/
+void DiagramContextWidget::checkTableRows() {
+	refreshFormatLabel();
+	if (!nameLessRowsCount()) {
+		int new_idx = table_ -> rowCount();
+		table_ -> setRowCount(new_idx + 1);
+		table_ -> setItem(new_idx, 0, new QTableWidgetItem(""));
+		table_ -> setItem(new_idx, 1, new QTableWidgetItem(""));
+	}
+}
+
+/**
+	Initialize child widgets.
+*/
+void DiagramContextWidget::initWidgets() {
+	format_label = new QLabel();
+	format_label -> setWordWrap(true);
+	format_label -> setAlignment(Qt::AlignJustify);
+	
+	table_ = new QTableWidget(0, 2);
+	table_ -> setSelectionMode(QAbstractItemView::SingleSelection);
+	table_ -> setHorizontalHeaderLabels(QStringList() << tr("Nom", "table header") << tr("Valeur", "table header"));
+	table_ -> horizontalHeader() -> setStretchLastSection(true);
+	
+	connect(table_, SIGNAL(itemChanged(QTableWidgetItem *)), this, SLOT(checkTableRows()));
+}
+
+/**
+	Initialize the layout of this widget.
+*/
+void DiagramContextWidget::initLayout() {
+	QVBoxLayout *vlayout0 = new QVBoxLayout();
+	vlayout0 -> addWidget(format_label);
+	vlayout0 -> addWidget(table_);
+	setLayout(vlayout0);
+}