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https://github.com/jesseduffield/lazygit.git
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f933a2f7ec
We upgraded our minimum Go version to 1.21 in commit 57ac9c2189458a7f0e63c2e9cac8334694a3d545. We can now replace our `utils.Min` and `utils.Max` functions with the built-in `min` and `max`. Reference: https://go.dev/ref/spec#Min_and_max Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
75 lines
3.1 KiB
Go
75 lines
3.1 KiB
Go
package controllers
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import (
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"github.com/jesseduffield/lazygit/pkg/config"
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"github.com/jesseduffield/lazygit/pkg/gui/types"
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)
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// To be called after pressing up-arrow; checks whether the cursor entered the
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// top scroll-off margin, and so the view needs to be scrolled up one line
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func checkScrollUp(view types.IViewTrait, userConfig *config.UserConfig, lineIdxBefore int, lineIdxAfter int) {
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if userConfig.Gui.ScrollOffBehavior != "jump" {
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viewPortStart, viewPortHeight := view.ViewPortYBounds()
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linesToScroll := calculateLinesToScrollUp(
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viewPortStart, viewPortHeight, userConfig.Gui.ScrollOffMargin, lineIdxBefore, lineIdxAfter)
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if linesToScroll != 0 {
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view.ScrollUp(linesToScroll)
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}
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}
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}
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// To be called after pressing down-arrow; checks whether the cursor entered the
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// bottom scroll-off margin, and so the view needs to be scrolled down one line
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func checkScrollDown(view types.IViewTrait, userConfig *config.UserConfig, lineIdxBefore int, lineIdxAfter int) {
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if userConfig.Gui.ScrollOffBehavior != "jump" {
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viewPortStart, viewPortHeight := view.ViewPortYBounds()
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linesToScroll := calculateLinesToScrollDown(
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viewPortStart, viewPortHeight, userConfig.Gui.ScrollOffMargin, lineIdxBefore, lineIdxAfter)
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if linesToScroll != 0 {
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view.ScrollDown(linesToScroll)
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}
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}
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}
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func calculateLinesToScrollUp(viewPortStart int, viewPortHeight int, scrollOffMargin int, lineIdxBefore int, lineIdxAfter int) int {
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// Cap the margin to half the view height. This allows setting the config to
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// a very large value to keep the cursor always in the middle of the screen.
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// Use +.5 so that if the height is even, the top margin is one line higher
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// than the bottom margin.
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scrollOffMargin = min(scrollOffMargin, int((float64(viewPortHeight)+.5)/2))
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// Scroll only if the "before" position was visible (this could be false if
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// the scroll wheel was used to scroll the selected line out of view) ...
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if lineIdxBefore >= viewPortStart && lineIdxBefore < viewPortStart+viewPortHeight {
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marginEnd := viewPortStart + scrollOffMargin
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// ... and the "after" position is within the top margin (or before it)
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if lineIdxAfter < marginEnd {
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return marginEnd - lineIdxAfter
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}
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}
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return 0
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}
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func calculateLinesToScrollDown(viewPortStart int, viewPortHeight int, scrollOffMargin int, lineIdxBefore int, lineIdxAfter int) int {
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// Cap the margin to half the view height. This allows setting the config to
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// a very large value to keep the cursor always in the middle of the screen.
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// Use -.5 so that if the height is even, the bottom margin is one line lower
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// than the top margin.
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scrollOffMargin = min(scrollOffMargin, int((float64(viewPortHeight)-.5)/2))
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// Scroll only if the "before" position was visible (this could be false if
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// the scroll wheel was used to scroll the selected line out of view) ...
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if lineIdxBefore >= viewPortStart && lineIdxBefore < viewPortStart+viewPortHeight {
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marginStart := viewPortStart + viewPortHeight - scrollOffMargin - 1
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// ... and the "after" position is within the bottom margin (or after it)
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if lineIdxAfter > marginStart {
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return lineIdxAfter - marginStart
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}
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}
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return 0
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}
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