mirror of https://github.com/mum4k/termdash.git
68 lines
2.2 KiB
Go
68 lines
2.2 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package container
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// mouse_fsm.go implements a state machine that tracks mouse clicks in regards
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// to changing which container is focused.
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import (
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"github.com/mum4k/termdash/mouse"
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"github.com/mum4k/termdash/terminalapi"
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)
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// mouseStateFn is a single state in the focus tracking state machine.
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// Returns the next state.
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type mouseStateFn func(ft *focusTracker, m *terminalapi.Mouse) mouseStateFn
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// nextForLeftClick determines the next state for a left mouse click.
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func nextForLeftClick(ft *focusTracker, m *terminalapi.Mouse) mouseStateFn {
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// The click isn't in any known container.
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if ft.candidate = pointCont(ft.container, m.Position); ft.candidate == nil {
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return mouseWantLeftButton
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}
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return mouseWantRelease
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}
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// mouseWantLeftButton is the initial state, expecting a left button click inside a container.
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func mouseWantLeftButton(ft *focusTracker, m *terminalapi.Mouse) mouseStateFn {
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if m.Button != mouse.ButtonLeft {
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return mouseWantLeftButton
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}
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return nextForLeftClick(ft, m)
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}
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// mouseWantRelease waits for a mouse button release in the same container as
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// the click or a timeout or other left mouse button click.
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func mouseWantRelease(ft *focusTracker, m *terminalapi.Mouse) mouseStateFn {
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switch m.Button {
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case mouse.ButtonLeft:
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return nextForLeftClick(ft, m)
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case mouse.ButtonRelease:
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// Process the release.
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default:
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return mouseWantLeftButton
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}
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// The release happened in another container.
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if ft.candidate != pointCont(ft.container, m.Position) {
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return mouseWantLeftButton
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}
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ft.container = ft.candidate
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ft.candidate = nil
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return mouseWantLeftButton
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}
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