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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; |
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TYPE |
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tScroll* = POINTER TO RECORD |
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vertical, mouse: BOOLEAN; |
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canvas: G.tCanvas; |
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xSize*, ySize*, pos, mousePos: INTEGER; |
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color, bkColor: INTEGER; |
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value*, maxVal*: INTEGER |
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END; |
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PROCEDURE draw* (scroll: tScroll; x, y: INTEGER); |
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VAR |
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pos, a, b: INTEGER; |
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canvas: G.tCanvas; |
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BEGIN |
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IF scroll.vertical THEN |
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a := scroll.ySize; |
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b := scroll.xSize |
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ELSE |
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a := scroll.xSize; |
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b := scroll.ySize |
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END; |
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IF scroll.maxVal > 0 THEN |
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pos := (a - b)*scroll.value DIV scroll.maxVal |
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ELSE |
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pos := 0 |
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END; |
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canvas := scroll.canvas; |
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G.SetColor(canvas, scroll.bkColor); |
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G.clear(canvas); |
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G.SetColor(canvas, 0808080H); |
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G.Rect(canvas, 0, 0, scroll.xSize - 1, scroll.ySize - 1); |
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G.SetColor(canvas, scroll.color); |
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DEC(b, 2); |
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IF scroll.vertical THEN |
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G.FillRect(canvas, 1, pos + 1, b, pos + b); |
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G.SetColor(canvas, 0404040H); |
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G.HLine(canvas, pos + 1 + b DIV 2, 4, b - 4); |
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G.HLine(canvas, pos + 1 + b DIV 2 - 3, 6, b - 6); |
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G.HLine(canvas, pos + 1 + b DIV 2 + 3, 6, b - 6); |
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ELSE |
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G.FillRect(canvas, pos + 1, 1, pos + b, b); |
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G.SetColor(canvas, 0404040H); |
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G.VLine(canvas, pos + b DIV 2, 4, b - 4); |
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G.VLine(canvas, pos + b DIV 2 - 3, 6, b - 6); |
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G.VLine(canvas, pos + b DIV 2 + 3, 6, b - 6); |
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END; |
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scroll.pos := pos; |
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G.DrawCanvas(canvas, x, y); |
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END draw; |
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PROCEDURE create* (xSize, ySize: INTEGER; color, bkColor: INTEGER): tScroll; |
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VAR |
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scroll: tScroll; |
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BEGIN |
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NEW(scroll); |
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scroll.xSize := xSize; |
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scroll.ySize := ySize; |
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scroll.vertical := xSize < ySize; |
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scroll.maxVal := 30; |
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scroll.value := 0; |
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scroll.mouse := FALSE; |
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scroll.bkColor := bkColor; |
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scroll.color := color; |
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scroll.canvas := G.CreateCanvas(xSize, ySize) |
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RETURN scroll |
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END create; |
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PROCEDURE resize* (scroll: tScroll; xSize, ySize: INTEGER); |
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BEGIN |
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scroll.xSize := xSize; |
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scroll.ySize := ySize; |
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scroll.vertical := xSize < ySize; |
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G.destroy(scroll.canvas); |
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scroll.canvas := G.CreateCanvas(xSize, ySize); |
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END resize; |
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PROCEDURE mouse* (scroll: tScroll; x, y: INTEGER); |
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VAR |
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pos, b: INTEGER; |
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BEGIN |
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IF scroll.vertical THEN |
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pos := y - 1; |
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b := scroll.xSize - 2 |
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ELSE |
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pos := x - 1; |
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b := scroll.ySize - 2 |
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END; |
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IF ~scroll.mouse THEN |
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scroll.mouse := TRUE; |
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IF (scroll.pos <= pos) & (pos <= scroll.pos + b - 1) THEN |
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scroll.mousePos := pos - scroll.pos |
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ELSE |
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scroll.mousePos := b DIV 2; |
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scroll.value := (pos - scroll.mousePos)*scroll.maxVal DIV ABS(scroll.xSize - scroll.ySize) |
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END |
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ELSE |
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scroll.value := (pos - scroll.mousePos)*scroll.maxVal DIV ABS(scroll.xSize - scroll.ySize) |
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END; |
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IF scroll.value < 0 THEN |
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scroll.value := 0 |
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ELSIF scroll.value > scroll.maxVal THEN |
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scroll.value := scroll.maxVal |
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END |
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END mouse; |
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PROCEDURE MouseUp* (scroll: tScroll); |
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BEGIN |
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IF scroll # NIL THEN |
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scroll.mouse := FALSE |
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END |
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END MouseUp; |
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END Scroll. |