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scrolling.go
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scrolling.go
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/*
* Copyright (c) 2013-2021 Utkan Güngördü <[email protected]>
* Copyright (c) 2021-2024 Piotr Grabowski
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package gomicsv
import (
"github.com/gotk3/gotk3/gdk"
"github.com/gotk3/gotk3/gtk"
"github.com/fauu/gomicsv/util"
)
type DragScroll struct {
InProgress bool
StartX float64
StartY float64
StartHAdjustmentVal float64
StartVAdjustmentVal float64
}
func (app *App) scroll(dx, dy float64) {
if !app.archiveIsLoaded() {
return
}
imgw, imgh := app.getImageAreaInnerSize()
vadj := app.W.ScrolledWindow.GetVAdjustment()
hadj := app.W.ScrolledWindow.GetHAdjustment()
vIncrement := vadj.GetMinimumIncrement()
vVal := vadj.GetValue()
vMin := vadj.GetLower()
vMax := vadj.GetUpper() - float64(imgh) - 2
hIncrement := hadj.GetMinimumIncrement()
hVal := hadj.GetValue()
hMin := hadj.GetLower()
hMax := hadj.GetUpper() - float64(imgw) - 2
if dy > 0 {
if vVal >= vMax {
if app.Config.SmartScroll {
if app.S.SmartScrollInProgress {
app.nextPage()
app.S.SmartScrollInProgress = false
} else {
app.S.SmartScrollInProgress = true
}
}
} else {
vadj.SetValue(util.Clamp(vVal+vIncrement, vMin, vMax))
app.W.ScrolledWindow.SetVAdjustment(vadj)
app.S.SmartScrollInProgress = false
}
} else if dy < 0 {
if vVal <= vMin {
if app.Config.SmartScroll {
if app.S.SmartScrollInProgress {
app.previousPage()
app.S.SmartScrollInProgress = false
} else {
app.S.SmartScrollInProgress = true
}
}
} else {
vadj.SetValue(util.Clamp(vVal-vIncrement, vMin, vMax))
app.W.ScrolledWindow.SetVAdjustment(vadj)
app.S.SmartScrollInProgress = false
}
}
if dx > 0 && hVal < hMax {
hadj.SetValue(util.Clamp(hVal+hIncrement, hMin, hMax))
app.W.ScrolledWindow.SetHAdjustment(hadj)
} else if dx < 0 && hVal > hMin {
hadj.SetValue(util.Clamp(hVal-hIncrement, hMin, hMax))
app.W.ScrolledWindow.SetHAdjustment(hadj)
}
}
func (app *App) scrollToStart() {
app.W.ScrolledWindow.SetVAdjustment(nil) // Needed to prevent a bug where it scrolls back by itself
app.W.ScrolledWindow.GetVAdjustment().SetValue(0) // Vertical: top
var newHadj float64 = 0
if app.Config.MangaMode {
imgw, _ := app.getImageAreaInnerSize()
newHadj = float64(imgw)
}
app.W.ScrolledWindow.SetHAdjustment(nil)
app.W.ScrolledWindow.GetHAdjustment().SetValue(newHadj) // Horizontal: left (non-manga) or right (manga) edge
}
func (app *App) scrollToEnd() {
imgw, imgh := app.getImageAreaInnerSize()
app.W.ScrolledWindow.SetVAdjustment(nil)
app.W.ScrolledWindow.GetVAdjustment().SetValue(float64(imgh)) // Vertical: bottom
var newHadj float64 = 0
if !app.Config.MangaMode {
newHadj = float64(imgw)
}
app.W.ScrolledWindow.SetHAdjustment(nil)
app.W.ScrolledWindow.GetHAdjustment().SetValue(newHadj) // Horizontal: left (manga) or right (non-manga) edge
}
func (app *App) dragScrollStart(x, y, vAdjustmentVal, hAdjustmentVal float64) {
app.S.DragScroll.InProgress = true
app.S.DragScroll.StartX = x
app.S.DragScroll.StartY = y
app.S.DragScroll.StartVAdjustmentVal = vAdjustmentVal
app.S.DragScroll.StartHAdjustmentVal = hAdjustmentVal
app.setCursor(cursorGrabbing)
}
func (app *App) dragScrollUpdate(sw *gtk.ScrolledWindow, event *gdk.EventButton) {
deltaX := app.S.DragScroll.StartX - event.X()
sw.GetHAdjustment().SetValue(app.S.DragScroll.StartHAdjustmentVal + deltaX)
deltaY := app.S.DragScroll.StartY - event.Y()
sw.GetVAdjustment().SetValue(app.S.DragScroll.StartVAdjustmentVal + deltaY)
}
func (app *App) dragScrollEnd() {
app.S.DragScroll.InProgress = false
app.setCursor(cursorDefault)
}