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widget.go
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widget.go
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// Copyright 2015 The Tops'l Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use file except in compliance with the License.
// You may obtain a copy of the license at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package topsl
type Widget interface {
// Draw is called to inform the widget to draw itself.
Draw()
// Resize is called in response to a window resize. Unlike with
// other events, Resize performed by parents first, and they must
// then call their children. This is because the children need to
// see the updated sizes from the parents before they are called.
Resize()
// HandleEvent is called to ask the widget to handle any events.
// If the widget has consumed the event, it should return true.
// Generally, events are handled by the lower layers first, that
// is for example, a button may have a chance to handle an event
// before the enclosing window or panel.
HandleEvent(ev Event) bool
// SetView is used by callers to set the visual parent of the
// Widget. The Widget should use the View as a context for
// drawing.
SetView(view View)
}