void PaintedSlider::updateSliderPosition()
{
double l = (slider_->orientation() == Horizontal) ? w() : h();
double pixelsPerUnit = (l - slider_->handleWidth()) / range();
double u = ((double)slider_->value() - slider_->minimum()) * pixelsPerUnit;
if (slider_->orientation() == Horizontal) {
handle_->setOffsets(u, Left);
fill_->setWidth(u + slider_->handleWidth() / 2);
} else {
handle_->setOffsets(h() - slider_->handleWidth() - u, Top);
fill_->setHeight(u + slider_->handleWidth() / 2);
}
}
void PaintedSlider::updateState()
{
bool rtl = WApplication::instance()->layoutDirection() == RightToLeft;
Orientation o = slider_->orientation();
if (o == Horizontal) {
handle_->resize(slider_->handleWidth(), h());
handle_->setOffsets(0, Top);
} else {
handle_->resize(w(), slider_->handleWidth());
handle_->setOffsets(0, Left);
}
double l = o == Horizontal ? w() : h();
double pixelsPerUnit = (l - slider_->handleWidth()) / range();
std::string dir;
std::string size;
if (o == Horizontal) {
dir = rtl ? "right" : "left";
size = "width";
} else {
dir = "top";
size = "height";
}
char u = (o == Horizontal ? 'x' : 'y');
double max = l - slider_->handleWidth();
bool horizontal = o == Horizontal;
/*
* Note: cancelling the mouseDown event prevents the selection behaviour
*/
WStringStream mouseDownJS;
mouseDownJS << "obj.setAttribute('down', " WT_CLASS
<< ".widgetCoordinates(obj, event)." << u
<< ");"
<< WT_CLASS ".cancelEvent(event);";
WStringStream computeD; // = 'u' position relative to background, corrected for slider
computeD << "var objh = " << handle_->jsRef() << ","
<< "objf = " << fill_->jsRef() << ","
<< "objb = " << jsRef() << ","
<< "page_u = WT.pageCoordinates(event)." << u << ","
<< "widget_page_u = WT.widgetPageCoordinates(objb)." << u << ","
<< "pos = page_u - widget_page_u,"
<< "rtl = " << rtl << ","
<< "horizontal = " << horizontal << ";"
<< "if (rtl && horizontal)"
<< "pos = " << l << " - pos;"
<< "var d = pos - down;";
WStringStream mouseMovedJS;
mouseMovedJS << "var down = obj.getAttribute('down');"
<< "var WT = " WT_CLASS ";"
<< "if (down != null && down != '') {"
<< computeD.str()
<< "d = Math.max(0, Math.min(d, " << max << "));"
<< "var v = Math.round(d/" << pixelsPerUnit << ");"
<< "var intd = v*" << pixelsPerUnit << ";"
<< "if (Math.abs(WT.pxself(objh, '" << dir
<< "') - intd) > 1) {"
<< "objf.style." << size << " = ";
if (o == Vertical)
mouseMovedJS << '(' << max << " - intd + " << (slider_->handleWidth() / 2)
<< ")";
else
mouseMovedJS << "intd + " << (slider_->handleWidth() / 2);
mouseMovedJS << " + 'px';"
<< "objh.style." << dir << " = intd + 'px';"
<< "var vs = ";
if (o == Horizontal)
mouseMovedJS << "v + " << slider_->minimum();
else
mouseMovedJS << slider_->maximum() << " - v";
mouseMovedJS << ";"
<< "var f = objb.parentNode.onValueChange;"
<< "if (f) f(vs);";
if (slider_->sliderMoved().needsUpdate(true))
mouseMovedJS << slider_->sliderMoved().createCall("vs");
mouseMovedJS << "}"
<< "}";
WStringStream mouseUpJS;
mouseUpJS << "var down = obj.getAttribute('down');"
<< "var WT = " WT_CLASS ";"
<< "if (down != null && down != '') {"
<< computeD.str()
<< "d += " << (slider_->handleWidth() / 2) << ";"
<< sliderReleased_.createCall("d")
<< "obj.removeAttribute('down');"
<< "}";
bool enabled = !slider_->isDisabled();
mouseDownJS_.setJavaScript(std::string("function(obj, event) {")
+ (enabled ? mouseDownJS.str() : "")
+ "}");
mouseMovedJS_.setJavaScript(std::string("function(obj, event) {")
+ (enabled ? mouseMovedJS.str() : "")
+ "}");
mouseUpJS_.setJavaScript(std::string("function(obj, event) {")
+ (enabled ? mouseUpJS.str() : "")
+ "}");
update();
updateSliderPosition();
}
