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extern "C" {
#include <assert.h>
}
#include <escher/view.h>
View::View() :
m_frame(KDRectZero),
m_superview(nullptr),
m_dirtyRect(KDRectZero)
{
}
View::~View() {
for (int i = 0; i < numberOfSubviews(); i++) {
View * subview = subviewAtIndex(i);
if (subview != nullptr) {
subview->m_superview = nullptr;
}
}
}
void View::resetSuperview() {
m_superview = nullptr;
}
void View::drawRect(KDContext * ctx, KDRect rect) const {
// By default, a view doesn't do anything
// It's transparent!
}
const Window * View::window() const {
if (m_superview == nullptr) {
return nullptr;
} else {
return m_superview->window();
}
}
void View::markRectAsDirty(KDRect rect) {
m_dirtyRect = m_dirtyRect.unionedWith(rect);
}
KDRect View::redraw(KDRect rect, KDRect forceRedrawRect) {
/* View::redraw recursively redraws the rectangle 'rect' of the view and all
* its subviews.
* To optimize the function, we redraw only the union of the current dirty
* rectangle with a rectangle forced to be redrawn (forceRedrawRect). This
* rectangle is initially empty and recursively expands by unioning with the
* rectangles that are redrawn. This process handles the case when several
* sister views are overlapping (provided that the sister views are indexed in
* the right order).
*/
if (window() == nullptr) {
/* That view (and all of its subviews) is offscreen. That means so are all
* of its subviews. So there's no point in drawing them. */
return KDRectZero;
}
/* First, for the current view, the rectangle to redraw is the union of the
* dirty rectangle and the rectangle forced to be redrawn. The rectangle to
* redraw must also be included in the current view bounds and in the
* rectangle rect. */
KDRect rectNeedingRedraw = rect
.intersectedWith(m_dirtyRect)
.unionedWith(forceRedrawRect
.intersectedWith(bounds()));
// This redraws the rectNeedingRedraw calling drawRect.
if (!rectNeedingRedraw.isEmpty()) {
KDPoint absOrigin = absoluteOrigin();
KDRect absRect = rectNeedingRedraw.translatedBy(absOrigin);
KDRect absClippingRect = absoluteVisibleFrame().intersectedWith(absRect);
KDContext * ctx = KDIonContext::sharedContext();
ctx->setOrigin(absOrigin);
ctx->setClippingRect(absClippingRect);
this->drawRect(ctx, rectNeedingRedraw);
}
// This initializes the area that has been redrawn.
KDRect redrawnArea = rectNeedingRedraw;
// Then, let's recursively draw our children over ourself
for (uint8_t i=0; i<numberOfSubviews(); i++) {
View * subview = this->subview(i);
if (subview == nullptr) {
continue;
}
assert(subview->m_superview == this);
// We transpose rect and forcedRedrawArea in the subview coordinates.
KDRect intersectionInSubview = rect
.intersectedWith(subview->m_frame)
.translatedBy(subview->m_frame.origin().opposite());
KDRect forcedRedrawAreaInSubview = redrawnArea
.translatedBy(subview->m_frame.origin().opposite());
// We redraw the current subview by passing the rectangle previously redrawn
// (by the parent view or previous sister views) as forced to be redraw.
KDRect subviewRedrawnArea =
subview->redraw(intersectionInSubview, forcedRedrawAreaInSubview);
// We expand the redrawn area to include the area just drawn.
redrawnArea = redrawnArea.unionedWith(subviewRedrawnArea.translatedBy(subview->m_frame.origin()));
}
// Eventually, mark that we don't need to be redrawn
m_dirtyRect = KDRectZero;
// The function returns the total area that have been redrawn.
return redrawnArea;
}
View * View::subview(int index) {
assert(index >= 0 && index < numberOfSubviews());
View * subview = subviewAtIndex(index);
if (subview != nullptr) {
subview->m_superview = this;
}
return subview;
}
void View::setSize(KDSize size) {
setFrame(KDRect(m_frame.origin(), size));
}
void View::setFrame(KDRect frame) {
if (frame == m_frame) {
return;
}
/* CAUTION: This code is not resilient to multiple consecutive setFrame()
* calls without intermediate redraw() calls. */
// TODO: Return if frame is equal to m_frame
if (m_superview != nullptr) {
/* We will move this view. This will leave a blank spot in its superview
* were it previously was.
* At this point, we know that the only area that really needs to be redrawn
* in the superview is the value of m_frame at the start of that method. */
m_superview->markRectAsDirty(m_frame);
}
m_frame = frame;
/* Now that we have moved, we have also dirtied our new absolute frame.
* There are two ways to declare this, which are semantically equivalent: we
* can either mark an area of our superview as dirty, or mark our whole frame
* as dirty. We pick the second option because it is more efficient. */
markRectAsDirty(bounds());
// FIXME: m_dirtyRect = bounds(); would be more correct (in case the view is being shrinked)
layoutSubviews();
}
KDPoint View::pointFromPointInView(View * view, KDPoint point) {
return point.translatedBy(view->absoluteOrigin().translatedBy(absoluteOrigin().opposite()));
}
KDRect View::bounds() const {
return m_frame.movedTo(KDPointZero);
}
KDPoint View::absoluteOrigin() const {
if (m_superview == nullptr) {
assert(this == (View *)window());
return m_frame.origin();
} else {
return m_frame.origin().translatedBy(m_superview->absoluteOrigin());
}
}
KDRect View::absoluteVisibleFrame() const {
if (m_superview == nullptr) {
assert(this == (View *)window());
return m_frame;
} else {
KDRect parentDrawingArea = m_superview->absoluteVisibleFrame();
KDRect absoluteFrame = m_frame.movedTo(absoluteOrigin());
return absoluteFrame.intersectedWith(parentDrawingArea);
}
}
KDSize View::minimalSizeForOptimalDisplay() const {
return KDSizeZero;
}
int View::numberOfSubviews() const {
return 0;
}
View * View::subviewAtIndex(int index) {
assert(false);
return nullptr;
}
void View::layoutSubviews() {
}
#if ESCHER_VIEW_LOGGING
const char * View::className() const {
return "View";
}
void View::logAttributes(std::ostream &os) const {
os << " address=\"" << this << "\"";
os << " frame=\"" << m_frame.x << "," << m_frame.y << "," << m_frame.width << "," << m_frame.height << "\"";
}
std::ostream &operator<<(std::ostream &os, View &view) {
os << "<" << view.className();
view.logAttributes(os);
os << ">";
for (int i=0; i<view.numberOfSubviews(); i++) {
assert(view.subview(i)->m_superview == &view);
os << *view.subview(i);
}
os << "</" << view.className() << ">";
return os;
}
#endif
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