forked from KolibriOS/kolibrios
403 lines
9.1 KiB
Plaintext
403 lines
9.1 KiB
Plaintext
(*
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Copyright 2021, 2022 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 <http://www.gnu.org/licenses/>.
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*)
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MODULE Scroll;
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IMPORT G := Graph, K := KolibriOS, U := Utils;
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CONST
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ScrollIPC* = 0;
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DELAY = 40;
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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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tProcedure* = PROCEDURE;
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VAR
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ScrollChange: tProcedure;
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delay: INTEGER;
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PROCEDURE MouseUp (VAR scroll: tScroll);
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BEGIN
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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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END MouseUp;
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PROCEDURE create* (vertical: BOOLEAN; width, height: INTEGER; btnSize, sliderSize: INTEGER; VAR scroll: tScroll);
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VAR
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res: tScroll;
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BEGIN
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MouseUp(res);
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res.vertical := vertical;
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res.left := 0;
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res.top := 0;
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res.width := width;
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res.height := height;
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res.btnSize := btnSize;
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res.sliderSize := sliderSize;
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res.pos := 0;
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res.maxVal := 0;
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res.canvas := G.CreateCanvas(width, height);
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scroll := res
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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.colors.line);
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G.Rect(canvas, left, top, right, bottom);
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END Rect;
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PROCEDURE _draw (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.colors.button
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ELSE
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color := K.colors.button_text
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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.colors.light);
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G.clear(canvas);
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G.SetColor(canvas, K.colors.line);
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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.colors.button);
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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.colors.button_text);
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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.colors.button);
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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.colors.button_text);
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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 _draw;
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PROCEDURE draw* (scroll: tScroll);
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BEGIN
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IF scroll.canvas # NIL THEN
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_draw(scroll)
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END
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END draw;
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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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draw(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 := FLOOR(FLT(value)*FLT(maxPos + 1)/FLT(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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draw(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 := FLOOR(FLT(scroll.maxVal)*FLT(pos)/FLT(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 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.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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draw(scroll)
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END MouseMove;
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PROCEDURE SendIPC;
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VAR
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msg: ARRAY 2 OF INTEGER;
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BEGIN
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msg[0] := ScrollIPC;
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msg[1] := 8;
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K.SendIPC(K.ThreadID(), msg)
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END SendIPC;
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PROCEDURE receiveIPC* (VAR IPC: ARRAY OF INTEGER; VAR scrollIPC: BOOLEAN);
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BEGIN
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scrollIPC := FALSE;
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ScrollChange;
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IF 0 IN K.MouseState() THEN
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WHILE (0 IN K.MouseState()) & (delay > 0) DO
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K.Pause(1);
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DEC(delay)
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END;
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IF delay = 0 THEN
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IPC[0] := 0;
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IPC[1] := 0;
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scrollIPC := TRUE;
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SendIPC;
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delay := 4
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ELSE
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delay := DELAY
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END
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ELSE
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delay := DELAY
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END
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END receiveIPC;
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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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DEC(x, scroll.left);
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DEC(y, scroll.top);
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scroll.mouse := TRUE;
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IF U.between(1, x, scroll.width - 2) & U.between(1, y, scroll.height - 2) 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 U.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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ELSIF U.between(0, c, scroll.btnSize - 1) THEN
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scroll.Dec := TRUE;
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SendIPC
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ELSIF U.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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draw(scroll)
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END
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END
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END MouseDown;
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PROCEDURE mouse* (VAR scroll: tScroll);
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VAR
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msState: SET;
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x, y: INTEGER;
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BEGIN
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K.mouse(msState, x, y);
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IF 0 IN msState THEN
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IF ~scroll.mouse THEN
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MouseDown(scroll, x, y)
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ELSIF scroll.Slider # -1 THEN
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MouseMove(scroll, x, y)
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END
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ELSIF scroll.mouse THEN
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MouseUp(scroll);
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draw(scroll)
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END
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END mouse;
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PROCEDURE init* (_ScrollChange: tProcedure);
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BEGIN
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delay := DELAY;
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ScrollChange := _ScrollChange
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END init;
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END Scroll. |