我想垂直拖动钛金属加速器中的视图,并在屏幕上显示整个视图高度时停止。 在开始时,视图的高度为140,底部为-120,因此我可以看到一块可以开始拖动的视图:
这就是我想垂直拖动" myView",x轴保持为0所以我只能从下到上拖动它,目的是在显示所有myView高度时停止拖动(所有myView都可见)
var WIDTH = (OS_ANDROID) ? Ti.Platform.displayCaps.platformWidth / dpi : Ti.Platform.displayCaps.platformWidth;
var HEIGHT = (OS_ANDROID) ? Ti.Platform.displayCaps.platformHeight / dpi : Ti.Platform.displayCaps.platformHeight;
var sx = 0;
var sy = 0;
var cx = 0;
var cy = 0;
var xDistance = 0;
function onTouchStart(e) {
// start movement
sx = e.x;
sy = e.y;
cx = e.x;
cy = e.y;
console.log(e.x);
}
function onTouchMove(e) {
xDistance = cx - sx;
var yDistance = cy - sy;
var points = e.source.convertPointToView({
x: e.x,
y: e.y
}, $.single);
$.myView.applyProperties({
left: 0,
top: points.y,
opacity: 1
});
/*------------------------------------------------------
* HERE I TRY TO DETECT IF myView HEIGHT IS SHOWN ENTIRELY
* is myView.top + myView.height > viewport ?
------------------------------------------------------*/
var t = $.myView.top + $.myView.height;
if( t >= HEIGHT ){
alert('all myView is visible now ???');
return; // <= why this has no effect ??
}
cx = e.x;
cy = e.y;
}
function onTouchEnd(e) {
// check xDistance
}
$.myView.addEventListener("touchmove", onTouchMove);
$.myView.addEventListener("touchstart", onTouchStart);
$.myView.addEventListener("touchend", onTouchEnd);
使用此代码,我可以垂直拖动myView,但是当完全显示此高度时,它不会停止。
我的第一个问题是: - 如果完全显示myView,我该怎么说? - 如果显示所有myView高度,如何禁用垂直拖动到顶部?
谢谢
答案 0 :(得分:0)
onTouchMove函数应该是这样的。
function onTouchMove(e) {
/*------------------------------------------------------
* HERE I TRY TO DETECT IF myView HEIGHT IS SHOWN ENTIRELY
* is myView.top + myView.height > viewport ?
------------------------------------------------------*/
var t = $.myView.top + $.myView.height;
if( t >= HEIGHT ){
alert('all myView is visible now ???');
return; // <= why this has no effect ??
}
xDistance = cx - sx;
var yDistance = cy - sy;
var points = e.source.convertPointToView({
x: e.x,
y: e.y
}, $.single);
$.myView.applyProperties({
left: 0,
top: points.y,
opacity: 1
});
cx = e.x;
cy = e.y;
}