Title block template editor: the "Merge cells" and "Splti cell" actions are now enabled and disabled depending on what is currently selected.

git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/branches/0.3@1546 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/titleblock/qettemplateeditor.cpp

@@ -499,6 +499,7 @@ void QETTitleBlockTemplateEditor::selectedCellsChanged(QList<TitleBlockCell *> s
 	} else {
 		template_cell_editor_widget_ -> setVisible(false);
 	}
+	updateActions();
 }
 
 /**
@@ -561,10 +562,15 @@ void QETTitleBlockTemplateEditor::updateEditorTitle() {
 	adequate actions.
 */
 void QETTitleBlockTemplateEditor::updateActions() {
-	/// TODO complete this method
 	save_ -> setEnabled(!read_only_);
-	merge_cells_ -> setEnabled(!read_only_);
-	split_cell_ -> setEnabled(!read_only_);
+	
+	bool can_merge;
+	bool can_split;
+	if (!read_only_) {
+		template_edition_area_view_ -> analyzeSelectedCells(&can_merge, &can_split);
+	}
+	merge_cells_ -> setEnabled(!read_only_ && can_merge);
+	split_cell_ -> setEnabled(!read_only_ && can_split);
 }
 
 /**

sources/titleblock/templatecommands.cpp

@@ -577,8 +577,7 @@ MergeCellsCommand::MergeCellsCommand(const TitleBlockTemplateCellsSet &merged_ce
 	row_span_after_(-1),
 	col_span_after_(-1)
 {
-	// basic check
-	if (merged_cells.count() < 2) return;
+	if (!canMerge(merged_cells, tbtemplate)) return;
 	
 	// the spanning cell is the top left cell
 	TitleBlockTemplateVisualCell *top_left_cell = merged_cells.topLeftCell();
@@ -617,6 +616,25 @@ MergeCellsCommand::MergeCellsCommand(const TitleBlockTemplateCellsSet &merged_ce
 MergeCellsCommand::~MergeCellsCommand() {
 }
 
+/**
+	@param merged_cells Cell sto be merged.
+	@param tbtemplate Modified title block template.
+	@return true if the merge is feasible, false otherwise
+*/
+bool MergeCellsCommand::canMerge(const TitleBlockTemplateCellsSet &merged_cells, TitleBlockTemplate *tbtemplate) {
+	// basic checks
+	if (!merged_cells.isRectangle()) return(false);
+	if (merged_cells.count() < 2) return(false);
+	
+	// the spanning cell is the top left cell
+	TitleBlockTemplateVisualCell *top_left_cell = merged_cells.topLeftCell();
+	if (!top_left_cell || !top_left_cell -> cell()) return(false);
+	
+	if (!getBottomRightCell(merged_cells)) return(false);
+	
+	return(true);
+}
+
 /**
 	@return true if this command object is valid and usable, false otherwise.
 */
@@ -703,17 +721,10 @@ SplitCellsCommand::SplitCellsCommand(const TitleBlockTemplateCellsSet &splitted_
 	row_span_before_(-1),
 	col_span_before_(-1)
 {
-	// basic check: the command applies to a single visual cell only
-	if (splitted_cells.count() != 1) return;
-	
-	// fetch the spanning cell
-	spanning_cell_ = splitted_cells.first() -> cell();
-	if (!spanning_cell_) return;
-	
-	// ensure the cell spans over other cells and therefore can be splitted
-	if (!spanning_cell_ -> spans()) return;
+	if (!canSplit(splitted_cells, tbtemplate)) return;
 	
 	// retrieve values necessary for the undo operation
+	spanning_cell_ = splitted_cells.first() -> cell();
 	spanned_cells_ = tbtemplate_ -> spannedCells(spanning_cell_);
 	row_span_before_ = spanning_cell_ -> row_span;
 	col_span_before_ = spanning_cell_ -> col_span;
@@ -734,6 +745,27 @@ SplitCellsCommand::SplitCellsCommand(const TitleBlockTemplateCellsSet &splitted_
 SplitCellsCommand::~SplitCellsCommand() {
 }
 
+/**
+	@param splitted_cells Cell to be splitted.
+	@param tbtemplate Modified title block template.
+	@return true if the split is feasible, false otherwise
+*/
+bool SplitCellsCommand::canSplit(const TitleBlockTemplateCellsSet &splitted_cells, TitleBlockTemplate *tbtemplate) {
+	Q_UNUSED(tbtemplate)
+	
+	// basic check: the command applies to a single visual cell only
+	if (splitted_cells.count() != 1) return(false);
+	
+	// fetch the spanning cell
+	TitleBlockCell *spanning_cell = splitted_cells.first() -> cell();
+	if (!spanning_cell) return(false);
+	
+	// ensure the cell spans over other cells and therefore can be splitted
+	if (!spanning_cell -> spans()) return(false);
+	
+	return(true);
+}
+
 /**
 	@return true if this command object is valid and usable, false otherwise.
 */

sources/titleblock/templatecommands.h

@@ -180,6 +180,7 @@ class MergeCellsCommand : public TitleBlockTemplateCommand {
 	
 	// methods
 	public:
+	static bool canMerge(const TitleBlockTemplateCellsSet &, TitleBlockTemplate *);
 	bool isValid() const;
 	virtual void undo();
 	virtual void redo();
@@ -210,6 +211,7 @@ class SplitCellsCommand : public TitleBlockTemplateCommand {
 	
 	// methods
 	public:
+	static bool canSplit(const TitleBlockTemplateCellsSet &splitted_cells, TitleBlockTemplate *tbtemplate);
 	bool isValid() const;
 	virtual void undo();
 	virtual void redo();

sources/titleblock/templateview.cpp

@@ -251,19 +251,6 @@ void TitleBlockTemplateView::mergeSelectedCells() {
 	// retrieve the selected cells
 	TitleBlockTemplateCellsSet selected_cells = selectedCellsSet();
 	
-	// merging applies only to cells composing a rectangle
-	if (!selected_cells.isRectangle()) {
-		qDebug() << "selected cells are not composing a rectangle";
-		return;
-	}
-	
-	// the merge area may also be too small
-	if (selected_cells.count() < 2) {
-		qDebug() << "the merge area does not even contain 2 selected and mergeable cells";
-		return;
-	}
-	
-	qDebug() << Q_FUNC_INFO << "ok, ready for cells merge";
 	MergeCellsCommand *merge_command = new MergeCellsCommand(selected_cells, tbtemplate_);
 	if (merge_command -> isValid()) requestGridModification(merge_command);
 }
@@ -275,12 +262,6 @@ void TitleBlockTemplateView::splitSelectedCell() {
 	// retrieve the selected cells
 	TitleBlockTemplateCellsSet selected_cells = selectedCellsSet();
 	
-	// we expect only one visual cell to be selected
-	if (selected_cells.count() != 1) {
-		qDebug() << "please select a single cell";
-		return;
-	}
-	
 	SplitCellsCommand *split_command = new SplitCellsCommand(selected_cells, tbtemplate_);
 	if (split_command -> isValid()) requestGridModification(split_command);
 }
@@ -319,6 +300,30 @@ TitleBlockTemplateCellsSet TitleBlockTemplateView::cells(const QRectF &rect) con
 	return(makeCellsSetFromGraphicsItems(items));
 }
 
+/**
+	@param can_merge If non-zero, will be changed to reflect whether selected cells may be merged
+	@param can_merge If non-zero, will be changed to reflect whether selected cells may be splitted
+*/
+void TitleBlockTemplateView::analyzeSelectedCells(bool *can_merge, bool *can_split) {
+	if (!can_merge && !can_split) return;
+	
+	if (!tbtemplate_) {
+		if (can_merge) *can_merge = false;
+		if (can_split) *can_split = false;
+		return;
+	}
+	
+	// retrieve the selected cells
+	TitleBlockTemplateCellsSet selected_cells = selectedCellsSet();
+	
+	if (can_merge) {
+		*can_merge = MergeCellsCommand::canMerge(selected_cells, tbtemplate_);
+	}
+	if (can_split) {
+		*can_split = SplitCellsCommand::canSplit(selected_cells, tbtemplate_);
+	}
+}
+
 /**
 	@return the current size of the rendered title block template
 */

sources/titleblock/templateview.h

@@ -46,6 +46,7 @@ class TitleBlockTemplateView : public QGraphicsView {
 	virtual QList<TitleBlockCell *> selectedCells() const;
 	virtual TitleBlockTemplateCellsSet selectedCellsSet() const;
 	virtual TitleBlockTemplateCellsSet cells(const QRectF &) const;
+	virtual void analyzeSelectedCells(bool *, bool *);
 	virtual QSizeF templateSize() const;
 	virtual qreal templateWidth() const;
 	virtual qreal templateHeight() const;