如何从左到右滑动离子列表项？ [英] How to swipe from left to right Ionic list item?
本文介绍了如何从左到右滑动离子列表项？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想向双方滑动离子列表项。 （即左右和右 - 左）。它适用于左右滑动，但我无法将列表项向左侧滑动。
I want to swipe Ionic list items to both sides. (i.e left-right AND right-left). It works perfectly for right-left swipe but I am not able to swipe list item to left side.
我使用 $ ionicGesture 用于左右滑动，当我使用 swiperight 事件时，它也会给我一个警告：事件（$ ionicGesture.on（'swiperight） '，scope.reportEvent，elem）），但我无法让它在左侧显示 ion-option-button 。
I used $ionicGesture for left-right swipe, and it also gives me an alert when i use swiperight event: event($ionicGesture.on('swiperight', scope.reportEvent, elem)), but I am not able to let it show the ion-option-button at the left side.
这是我的指令和控制器代码：
Here is my directive and controller code:
.directive('onSwipeRight', function($ionicGesture) {
return {
restrict : 'A',
link : function(scope, elem, attrs) {
var gestureType = attrs.gestureType;
switch(gestureType) {
case 'swipeRight':
$ionicGesture.on('swiperight', scope.reportEvent, elem);
break;
case 'swipeleft':
$ionicGesture.on('swipeleft', scope.reportEvent, elem);
break;
case 'doubletap':
$ionicGesture.on('doubletap', scope.reportEvent, elem);
break;
case 'tap':
$ionicGesture.on('tap', scope.reportEvent, elem);
break;
}
}
}
})
.controller('ChatsCtrl', function($scope, Chats) {
// With the new view caching in Ionic, Controllers are only called
// when they are recreated or on app start, instead of every page change.
// To listen for when this page is active (for example, to refresh data),
// listen for the $ionicView.enter event:
//
//$scope.$on('$ionicView.enter', function(e) {
//});
$scope.chats = Chats.all();
$scope.remove = function(chat) {
Chats.remove(chat);
}
$scope.reportEvent = function (event) {
alert("hi");
console.log('Reporting : ' + event.type);
event.preventDefault();
};
})
这是我的html代码。
Here is my html code.
<ion-view view-title="Chats">
<ion-content>
<ion-list can-swipe="true">
<ion-item gesture-type="swipeRight" on-swipe-right="swipeRight()" class="item-remove-animate item-avatar item-icon-right" ng-repeat="chat in chats" type="item-text-wrap" href="#/tab/chats/{{chat.id}}">
<img ng-src="{{chat.face}}">
<h2>{{chat.name}}</h2>
<p>{{chat.lastText}}</p>
<i class="icon ion-chevron-right icon-accessory"></i>
<ion-option-button class="button-assertive" ng-click="share(item)" side="left">
Share
</ion-option-button>
<ion-option-button class="button-assertive" ng-click="remove(chat)" side="right">
Delete
</ion-option-button>
</ion-item>
</ion-list>
</ion-content>
</ion-view>
所以我想在左侧显示分享按钮，在右侧显示删除按钮。
So I want to display share button at left side and delete button at right side.
有人可以为我提供具体的解决方案吗？
Can anybody provide me specific solution for it?
推荐答案
我编辑了离子lib做类似的事情。但我不能做一个JSFiddle或一个代码笔我会给你链接到我修改的ionic.css和ionic.bundle.js！
I've edited ionic lib to do something like that. But i couldn't do a JSFiddle or a Code Pen i Will give you the link to my modified ionic.css and ionic.bundle.js!
TL; DR
只需更换它和你的一起，开始一个离子项目空白。并将此HTML放入其中：
Just replace it with yours, start an ionic project blank. And put this HTML in it:
<body ng-app="starter">
<ion-pane>
<ion-header-bar class="bar-stable">
<h1 class="title">Ionic Blank Starter</h1>
</ion-header-bar>
<ion-content>
<ion-list show-delete="false" can-swipe="true" swipe-direction="both">
<ion-item href="#">
Item 1
<ion-option-button side="right" class="button-light icon ion-heart"></ion-option-button>
<ion-option-button side="right" class="button-light icon ion-email"></ion-option-button>
<ion-option-button side="left" class="button-assertive icon ion-trash-a"></ion-option-button>
</ion-item>
<ion-item href="#">
Item 2
<ion-option-button class="button-light icon ion-heart"></ion-option-button>
<ion-option-button class="button-light icon ion-email"></ion-option-button>
<ion-option-button class="button-assertive icon ion-trash-a"></ion-option-button>
</ion-item>
</ion-list>
</ion-content>
</ion-pane>
</body>
您可以使用左，右或两者指定划像方向。
在离子选项按钮中你可以给它一个侧面。
You can specify the wipe direction with left, right or both. And in the ion-options-button you can give it a side.
希望它有所帮助，你只需要问一下！我稍后会尝试在代码中评论我的更改！
Hope it helps, anything you need just ask! I will try to comment my changes in the code later on!
编辑：
我会尝试解释我做了什么。
I will try to explain what i did.
首先更改ionOptionButton指令，为按钮创建div，左边一个，右边一个
First change the ionOptionButton directive to create to div for the button, one left and one right
//added second div with class item-options-left for the left buttons
var ITEM_TPL_OPTION_BUTTONS =
'<div class="item-options invisible">' +
'</div>' + '<div class="item-options-left invisible">' +
'</div>';
IonicModule.directive('ionOptionButton', [function () {
function stopPropagation(e) {
e.stopPropagation();
}
return {
restrict: 'E',
require: '^ionItem',
priority: Number.MAX_VALUE,
compile: function ($element, $attr) {
$attr.$set('class', ($attr['class'] || '') + ' button', true);
return function ($scope, $element, $attr, itemCtrl) {
if (!itemCtrl.optionsContainer) {
itemCtrl.optionsContainer = jqLite(ITEM_TPL_OPTION_BUTTONS);
itemCtrl.$element.append(itemCtrl.optionsContainer);
}
//[NEW] if it as an attribute side = 'left' put the button in the left container
if ($attr.side === 'left') {
angular.element(itemCtrl.optionsContainer[1]).append($element);
itemCtrl.$element.addClass('item-left-editable');
} else{
angular.element(itemCtrl.optionsContainer[0]).append($element);
itemCtrl.$element.addClass('item-right-editable');
}
//Don't bubble click up to main .item
$element.on('click', stopPropagation);
};
}
};
}]);
在ionic.css文件的左侧按钮中添加CSS
Add CSS to left buttons in ionic.css file
.item-options-left {
position: absolute;
top: 0;
left: 0;
z-index: 1;
height: 100%; }
.item-options-left .button {
height: 100%;
border: none;
border-radius: 0;
display: -webkit-inline-box;
display: -webkit-inline-flex;
display: -moz-inline-flex;
display: -ms-inline-flexbox;
display: inline-flex;
-webkit-box-align: center;
-ms-flex-align: center;
-webkit-align-items: center;
-moz-align-items: center;
align-items: center; }
.item-options .button:before {
margin: 0 auto; }
现在更改离子列表控制器以接受滑动方向属性
Now change the ion-list controller to accept swipe directions attribute
.controller('$ionicList', [
'$scope',
'$attrs',
'$ionicListDelegate',
'$ionicHistory',
function ($scope, $attrs, $ionicListDelegate, $ionicHistory) {
var self = this;
//[NEW] object with can-swipe attr and swipe-direction side attr, default direction is left
var swipe = {
isSwipeable: true,
side: 'left'
};
var isReorderShown = false;
var isDeleteShown = false;
var deregisterInstance = $ionicListDelegate._registerInstance(
self, $attrs.delegateHandle,
function () {
return $ionicHistory.isActiveScope($scope);
}
);
$scope.$on('$destroy', deregisterInstance);
self.showReorder = function (show) {
if (arguments.length) {
isReorderShown = !!show;
}
return isReorderShown;
};
self.showDelete = function (show) {
if (arguments.length) {
isDeleteShown = !!show;
}
return isDeleteShown;
};
//[NEW] get swipe direction attribute and store it in a variable to access in other function
self.canSwipeItems = function (can) {
if (arguments.length) {
swipe.isSwipeable = !!can;
swipe.side = $attrs.swipeDirection;
}
return swipe;
};
self.closeOptionButtons = function () {
self.listView && self.listView.clearDragEffects();
};
}]);
要结束，你应该用这个替换slideDrag函数，只需在ionic.bundle中搜索它。 js
To end, you should replace slideDrag function with this one, just search for it in ionic.bundle.js
//[NEW] add this var to the others in the function
var ITEM_OPTIONS_CLASS_RIGHT = 'item-options-left';
var SlideDrag = function (opts) {
this.dragThresholdX = opts.dragThresholdX || 10;
this.el = opts.el;
this.item = opts.item;
this.canSwipe = opts.canSwipe;
};
SlideDrag.prototype = new DragOp();
SlideDrag.prototype.start = function (e) {
var content, buttonsLeft, buttonsRight, offsetX, buttonsLeftWidth, buttonsRightWidth;
if (!this.canSwipe().isSwipeable) {
return;
}
if (e.target.classList.contains(ITEM_CONTENT_CLASS)) {
content = e.target;
} else if (e.target.classList.contains(ITEM_CLASS)) {
content = e.target.querySelector('.' + ITEM_CONTENT_CLASS);
} else {
content = ionic.DomUtil.getParentWithClass(e.target, ITEM_CONTENT_CLASS);
}
// If we don't have a content area as one of our children (or ourselves), skip
if (!content) {
return;
}
// Make sure we aren't animating as we slide
content.classList.remove(ITEM_SLIDING_CLASS);
// Grab the starting X point for the item (for example, so we can tell whether it is open or closed to start)
offsetX = parseFloat(content.style[ionic.CSS.TRANSFORM].replace('translate3d(', '').split(',')[0]) || 0;
// Grab the buttons
buttonsLeft = content.parentNode.querySelector('.' + ITEM_OPTIONS_CLASS);
if (!buttonsLeft) {
return;
}
//[NEW] get the Right buttons
buttonsRight = content.parentNode.querySelector('.' + ITEM_OPTIONS_CLASS_RIGHT);
if (!buttonsRight) {
return;
}
// [NEW] added the same functionality to both sides, to make buttons visible when dragged
if(e.gesture.direction === "left")
buttonsLeft.classList.remove('invisible');
else
buttonsRight.classList.remove('invisible');
//[NEW] added buttonRight and buttonLeft properties to currentDrag
buttonsLeftWidth = buttonsLeft.offsetWidth;
buttonsRightWidth = buttonsRight.offsetWidth;
this._currentDrag = {
buttonsLeft: buttonsLeft,
buttonsRight: buttonsRight,
buttonsLeftWidth: buttonsLeftWidth,
buttonsRightWidth: buttonsRightWidth,
content: content,
startOffsetX: offsetX
};
};
/**
* Check if this is the same item that was previously dragged.
*/
SlideDrag.prototype.isSameItem = function (op) {
if (op._lastDrag && this._currentDrag) {
return this._currentDrag.content == op._lastDrag.content;
}
return false;
};
SlideDrag.prototype.clean = function (isInstant) {
var lastDrag = this._lastDrag;
if (!lastDrag || !lastDrag.content) return;
lastDrag.content.style[ionic.CSS.TRANSITION] = '';
lastDrag.content.style[ionic.CSS.TRANSFORM] = '';
if (isInstant) {
lastDrag.content.style[ionic.CSS.TRANSITION] = 'none';
makeInvisible();
ionic.requestAnimationFrame(function () {
lastDrag.content.style[ionic.CSS.TRANSITION] = '';
});
} else {
ionic.requestAnimationFrame(function () {
setTimeout(makeInvisible, 250);
});
}
function makeInvisible() {
lastDrag.buttonsLeft && lastDrag.buttonsLeft.classList.add('invisible');
lastDrag.buttonsRight && lastDrag.buttonsRight.classList.add('invisible');
}
};
SlideDrag.prototype.drag = ionic.animationFrameThrottle(function (e) {
var buttonsLeftWidth;
var buttonsRightWidth;
// We really aren't dragging
if (!this._currentDrag) {
return;
}
// Check if we should start dragging. Check if we've dragged past the threshold,
// or we are starting from the open state.
if (!this._isDragging &&
((Math.abs(e.gesture.deltaX) > this.dragThresholdX) ||
(Math.abs(this._currentDrag.startOffsetX) > 0))) {
this._isDragging = true;
}
if (this._isDragging) {
buttonsLeftWidth = this._currentDrag.buttonsLeftWidth;
buttonsRightWidth = this._currentDrag.buttonsRightWidth;
// Grab the new X point, capping it at zero
//[NEW] added right swipe new position
if (this.canSwipe().side === 'left' || (this.canSwipe().side === 'both' && e.gesture.direction === 'left'))
var newX = Math.min(0, this._currentDrag.startOffsetX + e.gesture.deltaX);
else if (this.canSwipe().side === 'right' || (this.canSwipe().side === 'both' && e.gesture.direction === 'right'))
var newX = Math.max(0, this._currentDrag.startOffsetX + e.gesture.deltaX);
var buttonsWidth = 0;
if (e.gesture.direction === 'right')
buttonsWidth = buttonsRightWidth;
else
buttonsWidth = buttonsLeftWidth;
// If the new X position is past the buttons, we need to slow down the drag (rubber band style)
if (newX < -buttonsWidth) {
// Calculate the new X position, capped at the top of the buttons
newX = Math.min(-buttonsWidth, -buttonsWidth + (((e.gesture.deltaX + buttonsWidth) * 0.4)));
}
this._currentDrag.content.$$ionicOptionsOpen = newX !== 0;
this._currentDrag.content.style[ionic.CSS.TRANSFORM] = 'translate3d(' + newX + 'px, 0, 0)';
this._currentDrag.content.style[ionic.CSS.TRANSITION] = 'none';
}
});
SlideDrag.prototype.end = function (e, doneCallback) {
var self = this;
// There is no drag, just end immediately
if (!self._currentDrag) {
doneCallback && doneCallback();
return;
}
// If we are currently dragging, we want to snap back into place
// The final resting point X will be the width of the exposed buttons
var restingPoint;
if (e.gesture.direction === 'left' && (this.canSwipe().side === 'left' || this.canSwipe().side === 'both'))
restingPoint = -self._currentDrag.buttonsLeftWidth;
if (e.gesture.direction === 'right' && (this.canSwipe().side === 'right' || this.canSwipe().side === 'both'))
restingPoint = self._currentDrag.buttonsRightWidth;
// Check if the drag didn't clear the buttons mid-point
// and we aren't moving fast enough to swipe open
var buttonsWidth = 0;
if (e.gesture.direction === 'right')
buttonsWidth = self._currentDrag.buttonsRightWidth;
else
buttonsWidth = self._currentDrag.buttonsLeftWidth;
if (e.gesture.deltaX > -(buttonsWidth / 2)) {
// If we are going left or right but too slow, or going right, go back to resting
if ((e.gesture.direction == "left" || e.gesture.direction == "right") && Math.abs(e.gesture.velocityX) < 0.3) {
restingPoint = 0;
}
}
ionic.requestAnimationFrame(function () {
if (restingPoint === 0) {
self._currentDrag.content.style[ionic.CSS.TRANSFORM] = '';
var buttonsLeft = self._currentDrag.buttonsLeft;
var buttonsRight = self._currentDrag.buttonsRight;
setTimeout(function () {
buttonsLeft && buttonsLeft.classList.add('invisible');
buttonsRight && buttonsRight.classList.add('invisible');
}, 250);
} else {
self._currentDrag.content.style[ionic.CSS.TRANSFORM] = 'translate3d(' + restingPoint + 'px,0,0)';
}
self._currentDrag.content.style[ionic.CSS.TRANSITION] = '';
// Kill the current drag
if (!self._lastDrag) {
self._lastDrag = {};
}
ionic.extend(self._lastDrag, self._currentDrag);
if (self._currentDrag) {
self._currentDrag.buttons = null;
self._currentDrag.content = null;
}
self._currentDrag = null;
// We are done, notify caller
doneCallback && doneCallback();
});
};
我的解决方案并不完美，但确实有效。还有其他方法可以做到这一点，我这样做是为了更好地了解离子的工作原理以及它们如何做离子指令。
My solution is not perfect, but it works. and there are others ways of doing this, i did it this way to understand better how Ionic works and how they do Ionic directives.
欢迎任何反馈意见，您可以尝试自己制作或改进此反馈。
Any feedback is welcome, and with this you can try to make your own or improve this one.
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