RectangleWin/snap.go at main · phoeagon/RectangleWin · GitHub

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// Copyright 2022 Ahmet Alp Balkan
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this 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 main

import "github.com/gonutz/w32/v2"

// TODO find a way to round up divisions consistently, otherwise we end up with off by 1px

func toLeft(d w32.RECT, mul, div int32) w32.RECT {
	return w32.RECT{
		Left:   d.Left,
		Top:    d.Top,
		Right:  d.Left + (d.Width()*mul)/div,
		Bottom: d.Top + d.Height()}
}

func toRight(d w32.RECT, mul, div int32) w32.RECT {
	return w32.RECT{
		Left:   d.Left + d.Width() - d.Width()*mul/div,
		Top:    d.Top,
		Right:  d.Left + d.Width(),
		Bottom: d.Top + d.Height()}
}

func toTop(d w32.RECT, mul, div int32) w32.RECT {
	return w32.RECT{
		Left:   d.Left,
		Top:    d.Top,
		Right:  d.Left + d.Width(),
		Bottom: d.Top + d.Height()*mul/div}
}

func toBottom(d w32.RECT, mul, div int32) w32.RECT {
	return w32.RECT{
		Left:   d.Left,
		Top:    d.Top + d.Height() - d.Height()*mul/div,
		Right:  d.Left + d.Width(),
		Bottom: d.Top + d.Height()}
}

func leftHalf(disp, _ w32.RECT) w32.RECT      { return toLeft(disp, 1, 2) }
func leftOneThirds(disp, _ w32.RECT) w32.RECT { return toLeft(disp, 1, 3) }
func leftTwoThirds(disp, _ w32.RECT) w32.RECT { return toLeft(disp, 2, 3) }

func topHalf(disp, _ w32.RECT) w32.RECT      { return toTop(disp, 1, 2) }
func topOneThirds(disp, _ w32.RECT) w32.RECT { return toTop(disp, 1, 3) }
func topTwoThirds(disp, _ w32.RECT) w32.RECT { return toTop(disp, 2, 3) }

func rightHalf(disp, _ w32.RECT) w32.RECT      { return toRight(disp, 1, 2) }
func rightOneThirds(disp, _ w32.RECT) w32.RECT { return toRight(disp, 1, 3) }
func rightTwoThirds(disp, _ w32.RECT) w32.RECT { return toRight(disp, 2, 3) }

func bottomHalf(disp, _ w32.RECT) w32.RECT      { return toBottom(disp, 1, 2) }
func bottomOneThirds(disp, _ w32.RECT) w32.RECT { return toBottom(disp, 1, 3) }
func bottomTwoThirds(disp, _ w32.RECT) w32.RECT { return toBottom(disp, 2, 3) }

func topLeftHalf(disp, _ w32.RECT) w32.RECT      { return merge(toLeft(disp, 1, 2), toTop(disp, 1, 2)) }
func topLeftTwoThirds(disp, _ w32.RECT) w32.RECT { return merge(toLeft(disp, 2, 3), toTop(disp, 1, 2)) }
func topLeftOneThirds(disp, _ w32.RECT) w32.RECT { return merge(toLeft(disp, 1, 3), toTop(disp, 1, 2)) }

func maxHeight(disp, cur w32.RECT) w32.RECT {
	return w32.RECT{Left: cur.Left, Right: cur.Right, Top: disp.Top, Bottom: disp.Bottom}
}
func min(a, b int32) int32 {
	if a < b {
		return a
	}
	return b
}
func max(a, b int32) int32 {
	if a > b {
		return a
	}
	return b
}

// sign = 1 for positive. sign = -1 for negative.
func resizeByPercent(disp, cur w32.RECT, sign int32) w32.RECT {
	delta_x := (disp.Left - disp.Right) * sign / 20
	delta_y := (disp.Top - disp.Bottom) * sign / 20

	return w32.RECT{
		Left:   max(disp.Left, cur.Left+delta_x),
		Right:  min(disp.Right, cur.Right-delta_x),
		Top:    max(disp.Top, cur.Top+delta_y),
		Bottom: min(disp.Bottom, cur.Bottom-delta_y)}
}
func makeLarger(disp, cur w32.RECT) w32.RECT  { return resizeByPercent(disp, cur, 1) }
func makeSmaller(disp, cur w32.RECT) w32.RECT { return resizeByPercent(disp, cur, -1) }

func topRightHalf(disp, _ w32.RECT) w32.RECT { return merge(toRight(disp, 1, 2), toTop(disp, 1, 2)) }
func topRightTwoThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toRight(disp, 2, 3), toTop(disp, 1, 2))
}
func topRightOneThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toRight(disp, 1, 3), toTop(disp, 1, 2))
}

func bottomLeftHalf(disp, _ w32.RECT) w32.RECT {
	return merge(toLeft(disp, 1, 2), toBottom(disp, 1, 2))
}
func bottomLeftTwoThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toLeft(disp, 2, 3), toBottom(disp, 1, 2))
}
func bottomLeftOneThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toLeft(disp, 1, 3), toBottom(disp, 1, 2))
}

func bottomRightHalf(disp, _ w32.RECT) w32.RECT {
	return merge(toRight(disp, 1, 2), toBottom(disp, 1, 2))
}
func bottomRightTwoThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toRight(disp, 2, 3), toBottom(disp, 1, 2))
}
func bottomRightOneThirds(disp, _ w32.RECT) w32.RECT {
	return merge(toRight(disp, 1, 3), toBottom(disp, 1, 2))
}

func merge(x, y w32.RECT) w32.RECT {
	return w32.RECT{Left: x.Left, Right: x.Right, Top: y.Top, Bottom: y.Bottom}
}