114 lines
2.7 KiB
Plaintext
114 lines
2.7 KiB
Plaintext
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(*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* http://www.opensource.org/licenses/cddl1.php.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* http://www.opensource.org/licenses/cddl1.php. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying * information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2015 Andreas Schneider
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*)
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unit USelectionHelper;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils;
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type
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TSelectedRangeCallback = procedure(AX1, AY1, AX2, AY2: Word) of object;
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procedure SelectRange(ACallback: TSelectedRangeCallback);
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implementation
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uses
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UfrmMain, UWorldItem, math;
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type
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{ TRangeSelectionHelper }
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TRangeSelectionHelper = class
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constructor Create(ACallback: TSelectedRangeCallback);
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protected
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FCallback: TSelectedRangeCallback;
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FItem1: TWorldItem;
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FItem2: TWorldItem;
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procedure TileSelected(AWorldItem: TWorldItem);
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procedure Finish;
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public
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procedure Run;
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end;
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procedure SelectRange(ACallback: TSelectedRangeCallback);
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var
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helper: TRangeSelectionHelper;
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begin
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helper := TRangeSelectionHelper.Create(ACallback);
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helper.Run;
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//Cleanup will follow asynchroneously
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end;
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{ TRangeSelectionHelper }
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constructor TRangeSelectionHelper.Create(ACallback: TSelectedRangeCallback);
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begin
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FCallback := ACallback;
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FItem1 := nil;
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FItem2 := nil;
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end;
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procedure TRangeSelectionHelper.TileSelected(AWorldItem: TWorldItem);
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begin
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if FItem1 = nil then
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FItem1 := AWorldItem
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else if FItem2 = nil then
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begin
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FItem2 := AWorldItem;
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Finish;
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end;
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end;
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procedure TRangeSelectionHelper.Finish;
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var
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minX, minY: Word;
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maxX, maxY: Word;
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begin
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frmMain.UnregisterSelectionListener(@TileSelected);
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minX := Min(FItem1.X, FItem2.X);
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minY := Min(FItem1.Y, FItem2.Y);
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maxX := Max(FItem1.X, FItem2.X);
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maxY := Max(FItem1.Y, FItem2.Y);
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FCallback(minX, minY, maxX, maxY);
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Free; //We use this class only once, so it can cleanup after itself
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end;
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procedure TRangeSelectionHelper.Run;
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begin
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//TODO show indicator and option to cancel
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//TODO keep track of instance (global variable maybe?)
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frmMain.RegisterSelectionListener(@TileSelected);
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frmMain.SwitchToSelection;
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end;
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end.
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