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/* ************************************************************************
qooxdoo - the new era of web development
http://qooxdoo.org
Copyright:
2006 by STZ-IDA, Germany, http://www.stz-ida.de
License:
LGPL 2.1: http://www.gnu.org/licenses/lgpl.html
Authors:
* Til Schneider (til132)
************************************************************************ */
/* ************************************************************************
************************************************************************ */
/**
* A scroll bar.
*
* @param horizontal {boolean ? false} whether the scroll bar should be
* horizontal. If false it will be vertical.
*/
qx.OO.defineClass("qx.ui.core.ScrollBar", qx.ui.layout.BoxLayout,
function(horizontal) {
qx.ui.layout.BoxLayout.call(this, horizontal ? "horizontal" : "vertical");
this._horizontal = (horizontal == true);
this._scrollBar = new qx.ui.layout.CanvasLayout;
if (qx.sys.Client.getInstance().isGecko()) {
// NOTE: We have to force not using position:absolute, because this causes
// strange looking scrollbars in some cases (e.g. in Firefox under
// Linux the horizontal scrollbar is too high)
this._scrollBar.setStyleProperty("position", "");
}
this._scrollBar.setOverflow(horizontal ? "scrollX" : "scrollY");
this._scrollBar.enableInlineEvent("scroll");
this._scrollBar.addEventListener("scroll", this._onscroll, this);
this._scrollContent = new qx.ui.basic.Terminator;
if (qx.sys.Client.getInstance().isGecko()) {
this._scrollContent.setStyleProperty("position", "");
}
this._scrollBar.add(this._scrollContent);
if (this._horizontal) {
this._scrollContent.setHeight(5);
this._scrollBar.setWidth("100%");
this._scrollBar.setHeight(this._getScrollBarWidth());
// IE needs that the scrollbar element has a width of +1
if (qx.sys.Client.getInstance().isMshtml()) {
this.setHeight(this._getScrollBarWidth());
this.setOverflow("hidden");
this._scrollBar.setHeight(this._getScrollBarWidth() + 1);
this._scrollBar.setTop(-1);
}
} else {
this._scrollContent.setWidth(5);
this._scrollBar.setHeight("100%");
this._scrollBar.setWidth(this._getScrollBarWidth());
// IE needs that the scrollbar element has a width of +1
if (qx.sys.Client.getInstance().isMshtml()) {
this.setWidth(this._getScrollBarWidth());
this.setOverflow("hidden");
this._scrollBar.setWidth(this._getScrollBarWidth() + 1);
this._scrollBar.setLeft(-1);
}
}
this.add(this._scrollBar);
this.setMaximum(0);
});
/**
* The current value of the scroll bar. This value is between 0 and
* (maxium - size), where size is the width of a horizontal resp. the height of
* a vertical scroll bar in pixels.
*
* @see #maximum
*/
qx.OO.addProperty({ name:"value", type:"number", defaultValue:0, allowNull:false });
/**
* The maximum value of the scroll bar. Note that the size of the scroll bar is
* substracted.
*
* @see #value
*/
qx.OO.addProperty({ name:"maximum", type:"number", allowNull:false });
/**
* Whether to merge consecutive scroll event. If true, events will be collected
* until the user stops scrolling, so the scroll bar itself will move smoothly
* and the scrolled content will update asynchroniously.
*/
qx.OO.addProperty({ name:"mergeEvents", type:"boolean", defaultValue:false, allowNull:false });
// property checker
qx.Proto._checkValue = function(propValue, propData) {
var innerSize = !this.getElement() ? 0 :
(this._horizontal ? this.getInnerWidth() : this.getInnerHeight());
// NOTE: We can't use Number.limit here because our maximum may get negative
// (when the scrollbar isn't needed). In this case Number.limit returns
// this negative maximum instead of 0. But we need that the minimum is
// stronger than the maximum.
// -> We use Math.max and Math.min
return Math.max(0, Math.min(this.getMaximum() - innerSize, propValue));
}
// property modifier
qx.Proto._modifyValue = function(propValue, propOldValue, propData) {
if (! this._internalValueChange && this._isCreated) {
this._positionKnob(propValue);
}
return true;
}
// property modifier
qx.Proto._modifyMaximum = function(propValue, propOldValue, propData) {
if (this._horizontal) {
this._scrollContent.setWidth(propValue);
} else {
this._scrollContent.setHeight(propValue);
}
// recheck the value
this.setValue(this._checkValue(this.getValue()));
return true;
}
// property modifier
qx.Proto._modifyVisibility = function(propValue, propOldValue, propData) {
if (! propValue) {
this._positionKnob(0);
} else {
this._positionKnob(this.getValue());
}
return qx.ui.layout.BoxLayout.prototype._modifyVisibility.call(this, propValue, propOldValue, propData);
};
// overridden
qx.Proto._computePreferredInnerWidth = function() {
return this._horizontal ? 0 : this._getScrollBarWidth();
}
// overridden
qx.Proto._computePreferredInnerHeight = function() {
return this._horizontal ? this._getScrollBarWidth() : 0;
}
/**
* Gets the width of vertical scroll bar.
*
* @return {int} the width in pixels.
*/
qx.Proto._getScrollBarWidth = function() {
// Auto-detect the scrollbar width
if (qx.ui.core.ScrollBar._scrollBarWidth == null) {
var dummy = document.createElement("div");
dummy.style.width = "100px";
dummy.style.height = "100px";
dummy.style.overflow = "scroll";
dummy.style.visibility = "hidden";
document.body.appendChild(dummy);
qx.ui.core.ScrollBar._scrollBarWidth = dummy.offsetWidth - dummy.clientWidth;
document.body.removeChild(dummy);
}
return qx.ui.core.ScrollBar._scrollBarWidth;
}
/**
* Event handler. Called when the user scrolled.
*
* @param evt {Map} the event.
*/
qx.Proto._onscroll = function(evt) {
var value = this._horizontal ? this._scrollBar.getScrollLeft() : this._scrollBar.getScrollTop();
if (this.getMergeEvents()) {
this._lastScrollEventValue = value;
window.clearTimeout(this._setValueTimerId);
var self = this;
this._setValueTimerId = window.setTimeout(function() {
self._internalValueChange = true;
self.setValue(self._lastScrollEventValue);
self._internalValueChange = false;
qx.ui.core.Widget.flushGlobalQueues();
}, qx.ui.core.ScrollBar.EVENT_DELAY);
} else {
this._internalValueChange = true;
this.setValue(value);
this._internalValueChange = false;
qx.ui.core.Widget.flushGlobalQueues();
}
}
/**
* Positions the scroll bar knob at a certain value.
*
* @param value {int} The value where to postion the scroll bar.
*/
qx.Proto._positionKnob = function(value) {
if (this._horizontal) {
this._scrollBar.setScrollLeft(value);
} else {
this._scrollBar.setScrollTop(value);
}
}
// overridden
qx.Proto._afterAppear = function() {
qx.ui.layout.BoxLayout.prototype._afterAppear.call(this);
//this.debug("Setting to value: " + this.getValue());
this._positionKnob(this.getValue());
}
// overridden
qx.Proto.dispose = function() {
if (this.getDisposed()) {
return;
}
if (this._scrollContent) {
this._scrollContent.dispose();
this._scrollContent = null;
}
return qx.ui.layout.BoxLayout.prototype.dispose.call(this);
}
/**
* The delay when to update the scroll bar value after a scroll event if
* {@link #mergeEvents} is true (in milliseconds). All scroll events that arrive
* in shorter time will be merged.
*/
qx.Class.EVENT_DELAY = 250;
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