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imgui_selection.go
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/
imgui_selection.go
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// This file is part of Gopher2600.
//
// Gopher2600 is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Gopher2600 is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Gopher2600. If not, see <https://www.gnu.org/licenses/>.
package sdlimgui
// imguiSelection is useful helper for multiline selection
//
// use limits() to get start and end points of the selection and the inRange()
// function for checking if a value is within the selection limits
type imguiSelection struct {
a int
b int
}
func (sel *imguiSelection) clear() {
sel.a = -1
sel.b = -1
}
func (sel *imguiSelection) dragStart(i int) {
sel.a = i
sel.b = i
}
func (sel *imguiSelection) drag(i int) {
sel.b = i
}
// single() is functionally the same as dragStart()
func (sel *imguiSelection) single(i int) {
sel.dragStart(i)
}
func (sel imguiSelection) isSingle() bool {
return sel.a == sel.b
}
func (sel imguiSelection) inRange(i int) bool {
if sel.b < sel.a {
return i >= sel.b && i <= sel.a
}
return i >= sel.a && i <= sel.b
}
func (sel imguiSelection) limits() (int, int) {
if sel.a < sel.b {
return sel.a, sel.b
}
return sel.b, sel.a
}