void PaintedSlider::updateState()
{
bool rtl = WApplication::instance()->layoutDirection() ==
LayoutDirection::RightToLeft;
Orientation o = slider_->orientation();
if (o == Orientation::Horizontal) {
handle_->resize(slider_->handleWidth(), h());
handle_->setOffsets(0, Side::Top);
} else {
handle_->resize(w(), slider_->handleWidth());
handle_->setOffsets(0, Side::Left);
}
double l = o == Orientation::Horizontal ? w() : h();
double pixelsPerUnit = (l - slider_->handleWidth()) / range();
std::string dir;
std::string size;
if (o == Orientation::Horizontal) {
dir = rtl ? "right" : "left";
size = "width";
} else {
dir = "top";
size = "height";
}
char u = (o == Orientation::Horizontal ? 'x' : 'y');
double max = l - slider_->handleWidth();
bool horizontal = o == Orientation::Horizontal;
char buf[30]; // Buffer for round_js_str
/*
* 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 = " << slider_->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)";
computeD << "pos = " << Utils::round_js_str(l, 3, buf) << " - pos;";
computeD << "var d = pos - down;";
WStringStream mouseMovedJS;
mouseMovedJS << "var down = obj.getAttribute('down');"
<< "var WT = " WT_CLASS ";"
<< "if (down != null && down != '') {"
<< computeD.str();
mouseMovedJS << "d = Math.max(0, Math.min(d, " << Utils::round_js_str(max, 3, buf) << "));";
mouseMovedJS << "var v = Math.round(d/" << Utils::round_js_str(pixelsPerUnit, 3, buf) << ");";
mouseMovedJS << "var intd = v*" << Utils::round_js_str(pixelsPerUnit, 3, buf) << ";";
mouseMovedJS << "if (Math.abs(WT.pxself(objh, '" << dir
<< "') - intd) > 1) {"
<< "objf.style." << size << " = ";
if (o == Orientation::Vertical) {
mouseMovedJS << '(' << Utils::round_js_str(max, 3, buf);
mouseMovedJS << " - intd + " << (slider_->handleWidth() / 2)
<< ")";
} else
mouseMovedJS << "intd + " << (slider_->handleWidth() / 2);
mouseMovedJS << " + 'px';"
<< "objh.style." << dir << " = intd + 'px';"
<< "var vs = ";
if (o == Orientation::Horizontal)
mouseMovedJS << "v + " << slider_->minimum();
else
mouseMovedJS << slider_->maximum() << " - v";
mouseMovedJS << ";"
<< "var f = objb.onValueChange;"
<< "if (f) f(vs);";
if (slider_->sliderMoved().needsUpdate(true)) {
#ifndef WT_TARGET_JAVA
mouseMovedJS << slider_->sliderMoved().createCall({"vs"});
#else
mouseMovedJS << slider_->sliderMoved().createCall("vs");
#endif
}
mouseMovedJS << "}"
<< "}";
WStringStream mouseUpJS;
mouseUpJS << "var down = obj.getAttribute('down');"
<< "var WT = " WT_CLASS ";"
<< "if (down != null && down != '') {"
<< computeD.str()
<< "d += " << (slider_->handleWidth() / 2) << ";"
#ifndef WT_TARGET_JAVA
<< sliderReleased_.createCall({"Math.round(d)"})
#else
<< sliderReleased_.createCall("Math.round(d)")
#endif
<< "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() : "")
+ "}");
handleClickedJS_.setJavaScript(std::string("function(obj, event) {")
+ WT_CLASS + ".cancelEvent(event,"
+ WT_CLASS + ".CancelPropagate); }");
update();
updateSliderPosition();
}
