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The draggable Method

  • The draggable method allows you to convert any view or an array of views into draggable elements.
  • You can set basic animations when dragging or dropping elements using the drag: and drop: modifiers.
  • You can apply or animate the properties either globally or locally using the drag-apply or drag-animate classes.
  • You can also constrain any view using the horizontal-constraint or vertical-constraint classes.
// Calling a draggable method
$.draggableAnimation.draggable('A View or an array of Views')
info

You can create a blank Animation object or use an existing one to call the draggable method to convert a view or array of views into 'draggable' objects.

When using an Animation object on an array of views, it will handle the zIndex of each draggable element.

Draggable Example​

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false">
    <Label text="Draggable Example" class="mt-16 text-center" />

    <View id="red" class="ml-4 h-32 w-32 rounded-lg bg-red-500" />

    <View id="green" class="ml-10 h-32 w-32 rounded-lg bg-green-500" />

    <View id="blue" class="ml-16 h-32 w-32 rounded-lg bg-blue-500" />
  </Window>

  <Animation id="draggableAnimation" module="purgetss.ui" />
</Alloy>
index.js
$.index.open()

$.draggableAnimation.draggable([$.red, $.green, $.blue])

Draggable Method

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drag and drop Modifiers​

  • The drag: and drop: modifiers allow you to set basic animations while dragging and dropping elements.
  • You can set 'global' modifiers in the Animation object, or you can set individual modifiers for each view.
  • Local modifiers will overwrite any global modifier.
info

To simplify things, we are restricting the types of animations that can be applied while dragging (or dropping).

Mainly, we are not applying any size, scale, or anchorPoint transformation.

Drag & Drop Example​

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false">
    <Label text="Global Modifiers:\ndrag:duration-100 drag:opacity-50 drop:opacity-100" class="mt-16 text-center" />

    <!-- No local modifiers -->
    <Label id="red" class="mx-2 ml-4 h-32 w-32 rounded-lg bg-red-500 text-center text-xs text-white" text="No local modifiers" />

    <!-- drag:bg-green-800 drop:bg-green-500 -->
    <Label id="green" class="drag:bg-green-800 drop:bg-green-500 ml-10 h-32 w-32 rounded-lg bg-green-500 text-center text-xs text-white" text="drag:bg-green-800 drop:bg-green-500" />

    <!-- drag:opacity-25 -->
    <Label id="blue" class="drag:opacity-25 ml-16 h-32 w-32 rounded-lg bg-blue-500 text-center text-xs text-white" text="drag:opacity-25" />

    <!-- Global set of modifiers -->
    <Animation id="draggableAnimation" module="purgetss.ui" class="drag:duration-100 drag:opacity-50 drop:opacity-100" />
  </Window>
</Alloy>

Drag and Drop Modifiers

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draggingType Property​

To control how drag: and drop: modifiers are applied, you can use either the drag-animate (default) or drag-apply class. The drag-animate class will animate the properties, while the drag-apply class will apply them immediately.

tailwind.tss
/* Component(s): For the Animation Component */
/* Property(ies): draggingType */
.drag-apply { draggingType: 'apply' }
.drag-animate { draggingType: 'animate' }

Dragging Type Example​

In the following example, the Animation element sets the global dragging type to drag-apply, but the green square overwrites it to drag-animate.

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false">
    <Label text="draggingType Example:\ndrag-apply drag:duration-500 drag:opacity-50 drop:opacity-100" class="mt-16 text-center" />

    <!-- No local modifiers, will be using the global modifiers -->
    <Label id="red" class="ml-4 h-32 w-32 rounded-lg bg-red-500 text-center text-xs text-white" text="No local modifiers" />

    <!-- drag-animate drag:bg-green-800 drop:bg-green-500 -->
    <Label id="green" class="drag-animate drag:bg-green-800 drop:bg-green-500 ml-10 h-32 w-32 rounded-lg bg-green-500 text-center text-xs text-white" text="drag-animate drag:bg-green-800 drop:bg-green-500" />

    <!-- drag:opacity-25 -->
    <Label id="blue" class="drag:opacity-25 ml-16 h-32 w-32 rounded-lg bg-blue-500 text-center text-xs text-white" text="drag:opacity-25" />

    <!-- Global set of modifiers -->
    <Animation id="draggableAnimation" module="purgetss.ui" class="drag-apply drag:duration-500 drag:opacity-50 drop:opacity-100" />
  </Window>
</Alloy>

Dragging Type

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bounds Modifier​

  • You can set boundaries in which a view can move within its parent view using the horizontal-constraint or vertical-constraint classes.
  • You can set global boundaries in the Animation object and/or local boundaries for each individual child view.
  • Local values will overwrite any global values.

Bounds Example 1​

The card view has a boundary of m-4 and a bottom boundary of mb-16.

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false bg-green-50">
    <View class="mx-6 mb-6 mt-10 h-screen w-screen rounded-lg bg-green-200">
      <View id="card" class="bounds:m-2 bounds:mb-16 mt-8 h-24 w-64 shadow-lg">
        <View id="cardInside" class="w-screen rounded-lg border-2 border-purple-700 bg-white">
          <ImageView id="theImage" class="rounded-16 prevent-default-image m-4 ml-4 h-16 w-16 bg-gray-50" image="https://randomuser.me/api/portraits/women/17.jpg" />

          <View class="vertical ml-24 w-screen">
            <Label class="ml-0 text-sm font-bold text-gray-800" text="Ms. Jane Doe" />
            <Label class="ml-0 text-xs font-bold text-gray-400" text="Website Designer" />
          </View>
        </View>
      </View>

      <Label class="bg-(#80000000) mx-2 mb-2 h-12 w-screen rounded-lg text-center text-white" text="Some Element..." />
    </View>

    <Animation id="draggableAnimation" module="purgetss.ui" />
  </Window>
</Alloy>
index.js
$.index.open()

$.draggableAnimation.draggable($.card)

Local Bounds

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Bounds Example 2​

In this example, the boundaries are set globally in the draggableAnimation view.

Every card view will use these global values.

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false bg-green-50">
    <View class="wh-screen mx-6 mb-6 mt-10 rounded-lg bg-green-200">
      <View id="card" class="mt-8 h-24 w-64 shadow-lg">
        <View id="cardInside" class="w-screen rounded-lg border-2 border-purple-700 bg-white">
          <ImageView id="theImage" class="rounded-16 prevent-default-image wh-16 m-4 bg-gray-50" image="https://randomuser.me/api/portraits/women/17.jpg" />

          <View class="vertical ml-24 w-screen">
            <Label class="ml-0 text-sm font-bold text-gray-800" text="Ms. Jane Doe" />
            <Label class="ml-0 text-xs font-bold text-gray-400" text="Website Designer" />
          </View>
        </View>
      </View>

      <View id="card2" class="mt-40 h-24 w-64 shadow-lg">
        <View id="cardInside" class="w-screen rounded-lg border-2 border-purple-700 bg-white">
          <ImageView id="theImage" class="rounded-16 prevent-default-image wh-16 m-4 bg-gray-50" image="https://randomuser.me/api/portraits/women/21.jpg" />

          <View class="vertical ml-24 w-screen">
            <Label class="ml-0 text-sm font-bold text-gray-800" text="Ms. Jane Doe" />
            <Label class="ml-0 text-xs font-bold text-gray-400" text="Website Designer" />
          </View>
        </View>
      </View>

      <View id="card3" class="mt-72 h-24 w-64 shadow-lg">
        <View id="cardInside" class="w-screen rounded-lg border-2 border-purple-700 bg-white">
          <ImageView id="theImage" class="rounded-16 prevent-default-image wh-16 m-4 bg-gray-50" image="https://randomuser.me/api/portraits/women/25.jpg" />

          <View class="vertical ml-24 w-screen">
            <Label class="ml-0 text-sm font-bold text-gray-800" text="Ms. Jane Doe" />
            <Label class="ml-0 text-xs font-bold text-gray-400" text="Website Designer" />
          </View>
        </View>
      </View>

      <Label class="bg-(#80000000) mx-2 mb-2 h-12 w-screen rounded-lg text-center text-white" text="Some Element..." />
    </View>

    <Animation id="draggableAnimation" module="purgetss.ui" class="bounds:m-2 bounds:mb-16" />
  </Window>
</Alloy>
index.js
$.index.open()

$.draggableAnimation.draggable([$.card, $.card2, $.card3])

Global Bounds

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vertical and horizontal Constraints​

To add a vertical and horizontal constraint to any dragging element, set the vertical-constraint or horizontal-constraint classes on the view.

/* Component(s): Ti.UI.Animation */
/* Property(ies): A custom property to use it with the Animation module */
'.horizontal-constraint': { constraint: 'horizontal' }
'.vertical-constraint': { constraint: 'vertical' }

Constraint Example​

In this example, the card view will move only from side to side.

index.xml
<Alloy>
  <Window class="keep-screen-on exit-on-close-false">
    <View id="card" class="horizontal-constraint h-24 w-64 shadow-lg">
      <View id="cardInside" class="w-screen rounded-lg border-2 border-purple-700 bg-white">
        <ImageView id="theImage" class="rounded-16 wh-16 m-4 ml-4" image="https://randomuser.me/api/portraits/women/17.jpg" />

        <View class="vertical ml-24 w-screen">
          <Label class="ml-0 text-sm font-bold text-gray-800" text="Ms. Jane Doe" />
          <Label class="ml-0 text-xs font-bold text-gray-400" text="Website Designer" />
        </View>
      </View>
    </View>

    <Animation id="draggableAnimation" module="purgetss.ui" />
  </Window>
</Alloy>
index.js
$.index.open()

$.draggableAnimation.draggable($.card)

Horizontal Constraint

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