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(* |
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Copyright 2021 Anton Krotov |
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This file is part of CEdit. |
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CEdit is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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CEdit is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with CEdit. If not, see . |
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*) |
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MODULE Scroll; |
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IMPORT G := Graph, K := KolibriOS; |
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CONST |
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ScrollIPC* = 0; |
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TYPE |
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tScroll* = RECORD |
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vertical, Inc*, Dec*, mouse*: BOOLEAN; |
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top*, left*, |
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width*, height*: INTEGER; (* read only *) |
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btnSize, sliderSize: INTEGER; |
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pos, Slider, pos0, maxVal*, value*: INTEGER; |
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canvas*: G.tCanvas |
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END; |
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PROCEDURE create* (vertical: BOOLEAN; width, height: INTEGER; btnSize, sliderSize: INTEGER; VAR scroll: tScroll); |
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BEGIN |
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scroll.vertical := vertical; |
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scroll.Inc := FALSE; |
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scroll.Dec := FALSE; |
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scroll.Slider := -1; |
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scroll.mouse := FALSE; |
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scroll.left := 0; |
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scroll.top := 0; |
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scroll.width := width; |
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scroll.height := height; |
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scroll.btnSize := btnSize; |
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scroll.sliderSize := sliderSize; |
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scroll.pos := 0; |
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scroll.maxVal := 0; |
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scroll.canvas := G.CreateCanvas(width, height) |
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END create; |
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PROCEDURE Rect (canvas: G.tCanvas; left, top, right, bottom: INTEGER); |
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BEGIN |
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G.FillRect(canvas, left, top, right, bottom); |
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G.SetColor(canvas, K.borderColor); |
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G.Rect(canvas, left, top, right, bottom); |
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END Rect; |
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PROCEDURE _paint (scroll: tScroll); |
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VAR |
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canvas: G.tCanvas; |
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x, y, d, x1, x2, y1, y2, |
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width, height, btn: INTEGER; |
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PROCEDURE SetColor (canvas: G.tCanvas; c: BOOLEAN); |
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VAR |
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color: INTEGER; |
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BEGIN |
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IF c THEN |
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color := K.btnColor |
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ELSE |
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color := K.btnTextColor |
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END; |
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G.SetColor(canvas, color) |
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END SetColor; |
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BEGIN |
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btn := scroll.btnSize; |
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width := scroll.width; |
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height := scroll.height; |
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canvas := scroll.canvas; |
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G.SetColor(canvas, K.winColor); |
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G.clear(canvas); |
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G.SetColor(canvas, K.borderColor); |
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G.Rect(canvas, 0, 0, width - 1, height - 1); |
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IF scroll.vertical THEN |
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SetColor(canvas, ~scroll.Dec); |
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Rect(canvas, 0, 0, width - 1, btn - 1); |
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SetColor(canvas, ~scroll.Inc); |
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Rect(canvas, 0, height - btn, width - 1, height - 1); |
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G.SetColor(canvas, K.btnColor); |
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Rect(canvas, 0, btn + scroll.pos - 1, width - 1, btn + scroll.pos + scroll.sliderSize - 1); |
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G.SetColor(canvas, K.btnTextColor); |
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y := btn + scroll.pos + scroll.sliderSize DIV 2 - 1; |
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G.HLine(canvas, y, width DIV 4, 3*width DIV 4); |
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G.HLine(canvas, y - 3, width DIV 3, 2*width DIV 3); |
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G.HLine(canvas, y + 3, width DIV 3, 2*width DIV 3); |
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d := 4*width DIV 10; |
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x1 := (width - d) DIV 2; |
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x2 := x1 + d; |
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SetColor(canvas, scroll.Dec); |
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y := (btn - d DIV 2) DIV 2 + d DIV 2 - 1; |
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G.Triangle(canvas, x1 - 1, y, x2, y, G.triUp); |
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SetColor(canvas, scroll.Inc); |
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y := y + height - btn - d DIV 2 + 1; |
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G.Triangle(canvas, x1 - 1, y, x2, y, G.triDown); |
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ELSE |
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SetColor(canvas, ~scroll.Dec); |
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Rect(canvas, 0, 0, btn - 1, height - 1); |
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SetColor(canvas, ~scroll.Inc); |
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Rect(canvas, width - btn, 0, width - 1, height - 1); |
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G.SetColor(canvas, K.btnColor); |
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Rect(canvas, btn + scroll.pos - 1, 0, btn + scroll.pos + scroll.sliderSize - 1, height - 1); |
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G.SetColor(canvas, K.btnTextColor); |
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x := btn + scroll.pos + scroll.sliderSize DIV 2 - 1; |
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G.VLine(canvas, x, height DIV 4, 3*height DIV 4); |
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G.VLine(canvas, x - 3, height DIV 3, 2*height DIV 3); |
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G.VLine(canvas, x + 3, height DIV 3, 2*height DIV 3); |
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d := 4*height DIV 10; |
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y1 := (height - d) DIV 2; |
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y2 := y1 + d; |
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SetColor(canvas, scroll.Dec); |
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x := (btn - d DIV 2) DIV 2 + d DIV 2 - 1; |
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G.Triangle(canvas, x, y1 - 1, x, y2, G.triLeft); |
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SetColor(canvas, scroll.Inc); |
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x := x + width - btn - d DIV 2 + 1; |
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G.Triangle(canvas, x, y1 - 1, x, y2, G.triRight); |
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END; |
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G.DrawCanvas(scroll.canvas, scroll.left, scroll.top) |
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END _paint; |
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PROCEDURE paint* (scroll: tScroll); |
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BEGIN |
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IF scroll.canvas # NIL THEN |
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_paint(scroll) |
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END |
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END paint; |
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PROCEDURE resize* (VAR scroll: tScroll; width, height: INTEGER); |
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BEGIN |
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G.destroy(scroll.canvas); |
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scroll.canvas := G.CreateCanvas(width, height); |
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scroll.width := width; |
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scroll.height := height; |
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paint(scroll) |
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END resize; |
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PROCEDURE setValue* (VAR scroll: tScroll; value: INTEGER); |
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VAR |
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pos, maxPos, n, m: INTEGER; |
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BEGIN |
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IF scroll.vertical THEN |
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maxPos := scroll.height |
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ELSE |
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maxPos := scroll.width |
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END; |
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maxPos := maxPos - scroll.btnSize*2 - scroll.sliderSize + 1; |
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IF (value < 0) OR (scroll.maxVal <= 0) THEN |
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value := 0; |
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pos := 0 |
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ELSIF value > scroll.maxVal THEN |
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value := scroll.maxVal; |
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pos := maxPos |
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ELSE |
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IF (maxPos + 1) >= scroll.maxVal THEN |
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n := (maxPos + 1) DIV scroll.maxVal; |
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m := (maxPos + 1) MOD scroll.maxVal; |
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pos := value*n + MIN(value, m) |
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ELSE |
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pos := value*(maxPos + 1) DIV scroll.maxVal |
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END; |
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IF pos > maxPos THEN |
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pos := maxPos; |
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value := scroll.maxVal |
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END |
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END; |
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scroll.pos := pos; |
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scroll.value := value |
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END setValue; |
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PROCEDURE change* (VAR scroll: tScroll); |
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BEGIN |
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IF scroll.Inc THEN |
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setValue(scroll, scroll.value + 1) |
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ELSIF scroll.Dec THEN |
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setValue(scroll, scroll.value - 1) |
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END; |
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paint(scroll) |
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END change; |
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PROCEDURE ceil (p, q: INTEGER): INTEGER; |
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RETURN p DIV q + ORD(p MOD q # 0) |
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END ceil; |
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PROCEDURE setPos (VAR scroll: tScroll; pos: INTEGER); |
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VAR |
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maxPos, value, n, m, x, x0, q: INTEGER; |
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BEGIN |
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IF scroll.maxVal > 0 THEN |
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IF scroll.vertical THEN |
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maxPos := scroll.height |
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ELSE |
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maxPos := scroll.width |
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END; |
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maxPos := maxPos - scroll.btnSize*2 - scroll.sliderSize + 1; |
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IF pos <= 0 THEN |
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pos := 0; |
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value := 0 |
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ELSIF pos >= maxPos THEN |
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pos := maxPos; |
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value := scroll.maxVal |
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ELSE |
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IF scroll.maxVal <= maxPos + 1 THEN |
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n := (maxPos + 1) DIV scroll.maxVal; |
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m := (maxPos + 1) MOD scroll.maxVal; |
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q := m*(n + 1); |
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IF q < pos THEN |
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value := ceil(pos - m, n) |
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ELSIF q > pos THEN |
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value := ceil(pos, n + 1) |
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ELSE |
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value := m |
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END; |
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x := value*n + MIN(value, m); |
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x0 := (value - 1)*n + MIN(value - 1, m); |
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IF x - pos > pos - x0 THEN |
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pos := x0; |
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DEC(value) |
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ELSE |
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pos := x; |
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IF pos > maxPos THEN |
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pos := maxPos; |
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value := scroll.maxVal |
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END |
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END |
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ELSE |
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value := scroll.maxVal*pos DIV (maxPos + 1) |
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END |
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END |
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ELSE |
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pos := 0; |
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scroll.value := 0 |
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END; |
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scroll.pos := pos; |
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scroll.value := value |
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END setPos; |
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PROCEDURE isActive* (scroll: tScroll): BOOLEAN; |
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RETURN scroll.Inc OR scroll.Dec OR (scroll.Slider # -1) |
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END isActive; |
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PROCEDURE MouseMove* (VAR scroll: tScroll; x, y: INTEGER); |
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VAR |
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c: INTEGER; |
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BEGIN |
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IF scroll.Slider # -1 THEN |
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IF scroll.vertical THEN |
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c := y - scroll.top |
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ELSE |
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c := x - scroll.left |
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END; |
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setPos(scroll, scroll.pos0 + c - scroll.Slider); |
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paint(scroll) |
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END |
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END MouseMove; |
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PROCEDURE between (a, b, c: INTEGER): BOOLEAN; |
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RETURN (a <= b) & (b <= c) |
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END between; |
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PROCEDURE SendIPC*; |
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BEGIN |
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K.SendIPC(K.ThreadID(), ScrollIPC) |
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END SendIPC; |
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PROCEDURE MouseDown* (VAR scroll: tScroll; x, y: INTEGER); |
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VAR |
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c, size: INTEGER; |
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BEGIN |
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x := x - scroll.left; |
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y := y - scroll.top; |
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scroll.mouse := TRUE; |
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IF between(0, x, scroll.width - 1) & between(0, y, scroll.height - 1) THEN |
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IF scroll.vertical THEN |
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c := y; |
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size := scroll.height |
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ELSE |
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c := x; |
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size := scroll.width |
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END; |
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IF between(scroll.btnSize + scroll.pos - 1, c, scroll.btnSize + scroll.pos + scroll.sliderSize - 1) THEN |
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scroll.pos0 := scroll.pos; |
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scroll.Slider := c |
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ELSE |
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IF between(0, c, scroll.btnSize - 1) THEN |
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scroll.Dec := TRUE; |
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SendIPC |
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ELSE |
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IF between(size - scroll.btnSize, c, size - 1) THEN |
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scroll.Inc := TRUE; |
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SendIPC |
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ELSE |
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setPos(scroll, c - scroll.btnSize - scroll.sliderSize DIV 2); |
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scroll.pos0 := scroll.pos; |
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scroll.Slider := c; |
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paint(scroll) |
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END |
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END |
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END |
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END |
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END MouseDown; |
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PROCEDURE MouseUp* (VAR scroll: tScroll); |
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BEGIN |
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IF scroll.mouse THEN |
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scroll.Slider := -1; |
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scroll.Inc := FALSE; |
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scroll.Dec := FALSE; |
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scroll.mouse := FALSE; |
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paint(scroll) |
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END |
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END MouseUp; |
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END Scroll. |