Tooltip

Remarks

The delay needs a clock, and the document now has one. A tooltip waits half a second before appearing, and nothing here is told what time it is except through input events — which stop arriving precisely when the pointer is resting. So it subscribes to Ticked, which a host with a frame loop drives through Tick, the same clock GestureRecognizer uses for a long press.

⚠ A host that never ticks gets a tooltip that never appears. Tick is still public and a caller may drive it directly; what is gone is the arrangement where every application had to remember to. Which of "never" and "instantly" is the better failure is arguable — what is not is that the difference used to be a method call in somebody else's loop.

It is never focusable and never takes the pointer: pointer-events: none in the theme, so a tooltip that lands under the cursor does not immediately hide itself by taking the hover away from the thing it describes.

Fields and properties (4)

• protected override string TagName

  The element name this type answers to when a caller does not choose one.

• public TimeSpan Delay
• public string? Label

  What it says.

• public static readonly UiPropertyKey DelayProperty

  Identity for Delay.

Methods (5)

• protected override void OnCreated()

  Builds whatever this element is made of, once, as it joins a document.

• protected override void OnRemoved()
• public void Attach(UiElement target)

  Attaches it to an element, so that hovering that element shows it.

• public void Tick(TimeSpan now)

  Tells it what time it is, so that a pointer that has rested long enough shows it.

• public void ClearDelay()

  Unsets Delay, so it takes its default or its ancestor's value again.

Used by (4)

• OverlayInteractionTestsVixen.Ui.Controls.Tests
• OverlayLifetimeTestsVixen.Ui.Controls.Tests
• CompositorViewVixen.Editor.AssetEditors
• InspectorRowsVixen.Editor.Inspector