Introduction of classes, structs and enums related to inset templates.

git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/branches/0.3@1129 bfdf4180-ca20-0410-9c96-a3a8aa849046

sources/insettemplaterenderer.cpp

@@ -0,0 +1,96 @@
+#include "insettemplaterenderer.h"
+#include "insettemplate.h"
+
+/**
+	Constructor
+	@param parnet Parent QObject of this renderer
+*/
+InsetTemplateRenderer::InsetTemplateRenderer(QObject *parent) :
+	QObject(parent),
+	inset_template_(0),
+	last_known_inset_width_(-1)
+{
+}
+
+/**
+	Destructor
+*/
+InsetTemplateRenderer::~InsetTemplateRenderer() {
+}
+
+/**
+	@return the inset template used for the rendering
+*/
+const InsetTemplate *InsetTemplateRenderer::insetTemplate() const {
+	return(inset_template_);
+}
+
+/**
+	@param inset_template Inset template to render.
+*/
+void InsetTemplateRenderer::setInsetTemplate(const InsetTemplate *inset_template) {
+	if (inset_template != inset_template_) {
+		inset_template_ = inset_template;
+		invalidateRenderedTemplate();
+	}
+}
+
+/**
+	@param context Diagram Context to use when rendering the inset
+*/
+void InsetTemplateRenderer::setContext(const DiagramContext &context) {
+	context_ = context;
+	invalidateRenderedTemplate();
+}
+
+/**
+	@return the height of the rendered template, or -1 if no template has been
+	set for this renderer.
+	@see InsetTemplate::height()
+*/
+int InsetTemplateRenderer::height() const {
+	if (!inset_template_) return(-1);
+	return(inset_template_ -> height());
+}
+
+/**
+	Render the inset.
+	@param provided_painter QPainter to use to render the inset.
+	@param inset_width The total width of the inset to render
+*/
+void InsetTemplateRenderer::render(QPainter *provided_painter, int inset_width) {
+	if (!inset_template_) return;
+	
+	// Do we really need to calculate all this again?
+	if (inset_width != last_known_inset_width_ || rendered_template_.isNull()) {
+		renderToQPicture(inset_width);
+	}
+	
+	provided_painter -> save();
+	rendered_template_.play(provided_painter);
+	provided_painter -> restore();
+}
+
+/**
+	Renders the inset to the internal QPicture
+	@param inset_width Width of the inset to render
+*/
+void InsetTemplateRenderer::renderToQPicture(int inset_width) {
+	if (!inset_template_) return;
+	
+	// we render the template on our internal QPicture
+	QPainter painter(&rendered_template_);
+	
+	inset_template_ -> render(painter, context_, inset_width);
+	
+	// memorize the last known width
+	last_known_inset_width_ = inset_width;
+}
+
+/**
+	Invalidates the previous rendering of the template by resetting the internal
+	QPicture.
+*/
+void InsetTemplateRenderer::invalidateRenderedTemplate() {
+	rendered_template_ = QPicture();
+}