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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit CumulativeSizes;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Integer._32;
type
TDeltaSizeMethod = (Distribute, LastColumn, FirstColumn);
TCumulativeSizes = class(TObject)
protected
FFirstVisible: TInteger32;
FLastVisible: TInteger32;
FFixedTotal: TBoolean;
function GetWeight(Index: TInteger32): TInteger32; virtual; abstract;
procedure SetWeight(Index: TInteger32; const Value: TInteger32); virtual; abstract;
function GetCount(): TInteger32; virtual; abstract;
procedure SetCount(const Value: TInteger32); virtual; abstract;
procedure SetVisible(Index: TInteger32; const Value: TBoolean); virtual; abstract;
function IndexWithRunningSum(RunningSum: TInteger32): TInteger32; virtual; abstract;
public
DefaultSize: TInteger32;
procedure Insert(Index: TInteger32; Value: TInteger32); virtual; abstract;
procedure Remove(Index: TInteger32); virtual; abstract;
procedure SetItemSizeAndRedistribute(Item: TInteger32; Size: TInteger32; Redistribute: TBoolean = True); virtual; abstract;
procedure SetItemSize(Item: TInteger32; Size: TInteger32; InPlace: TBoolean); virtual; abstract;
function ValidItemWithPosition(Position: TInteger32): TInteger32;
function ItemWithPosition(Position: TInteger32): TInteger32;
function ItemWithResizePosition(Position: TInteger32; Radius: TInteger32): TInteger32;
function ItemWithInsertPosition(Position: TInteger32): TInteger32;
function Size(Item: TInteger32): TInteger32; virtual; abstract;
function RunningSize(Item: TInteger32): TInteger32; virtual; abstract;
function TotalSize(): TInteger32; virtual; abstract;
procedure SetTotalSize(Value: TInteger32; DeltaSizeMethod: TDeltaSizeMethod); virtual; abstract;
function TotalScrollSize(AvailableSize: TInteger32): TInteger32;
function LowerBound(Item: TInteger32): TInteger32;
function Last(): TInteger32; // TODO: Move to an other object for headers, this is a Sizes object
procedure DetermineVisible(Offset: TInteger32; AvailableSpace: TInteger32);
function HasValidVisibleItems: TBoolean;
function Validate(Index: TInteger32): TInteger32; // TODO: Move to an other object for headers, this is a Sizes object
function IsVisible(Item: TInteger32): TBoolean;
function VisibleCount: TInteger32; deprecated; // Move to Visible interval
procedure ConfigureAsFixedTotalWithRelativeWeights(TotalSize: TInteger32);
property Count: TInteger32 read GetCount write SetCount;
property FirstVisible: TInteger32 read FFirstVisible;
property LastVisible: TInteger32 read FLastVisible;
property FixedTotal: TBoolean read FFixedTotal write FFixedTotal;
property Weight[Index: TInteger32]: TInteger32 read GetWeight write SetWeight;
property Visible[Index: TInteger32]: TBoolean write SetVisible;
end;
implementation
uses
Mathematics;
{ TCumulativeSizes }
procedure TCumulativeSizes.ConfigureAsFixedTotalWithRelativeWeights(TotalSize: TInteger32);
var
i: TInteger32;
begin
FixedTotal := TotalSize = Self.TotalSize();
if FixedTotal then
for i := 0 to Count - 1 do
Weight[i] := Size(i);
end;
procedure TCumulativeSizes.DetermineVisible(Offset: TInteger32; AvailableSpace: TInteger32);
begin
if Count > 0 then
begin
FFirstVisible := Minimum(IndexWithRunningSum(Offset), Count - 1);
FLastVisible := Minimum(IndexWithRunningSum(Offset + AvailableSpace), Count - 1);
end
else
begin
FFirstVisible := 0;
FLastVisible := -1;
end;
end;
function TCumulativeSizes.HasValidVisibleItems: TBoolean;
begin
Result := (FirstVisible <> -1) and (LastVisible <> -1);
end;
function TCumulativeSizes.IsVisible(Item: TInteger32): TBoolean;
begin
Result := (Item >= FirstVisible) and (Item <= LastVisible);
end;
function TCumulativeSizes.ItemWithInsertPosition(Position: TInteger32): TInteger32;
begin
if Position < 0 then
Result := 0
else if Position > TotalSize then
Result := Count
else
begin
Result := IndexWithRunningSum(Position);
if Position - LowerBound(Result) > Size(Result) div 2 then
Inc(Result);
end;
end;
function TCumulativeSizes.ItemWithPosition(Position: TInteger32): TInteger32;
begin
Result := IndexWithRunningSum(Position);
if Result >= Count then
Result := -1;
end;
function TCumulativeSizes.ItemWithResizePosition(Position: TInteger32; Radius: TInteger32): TInteger32;
var
Item: TInteger32;
RunningSize: TInteger32;
begin
Item := ItemWithPosition(Position);
Result := -1;
if Item <> -1 then
begin
RunningSize := Self.RunningSize(Item);
if Position >= RunningSize - Radius then
Result := Item
else if (Item > 0) and (Position <= RunningSize - Size(Item) + Radius) then
Result := Item - 1;
end;
end;
function TCumulativeSizes.Last: TInteger32;
begin
Result := Count - 1;
end;
function TCumulativeSizes.LowerBound(Item: TInteger32): TInteger32;
begin
if Item > 0 then
Result := RunningSize(Item - 1)
else
Result := 0;
end;
function TCumulativeSizes.TotalScrollSize(AvailableSize: TInteger32): TInteger32;
begin
if FixedTotal then
Result := AvailableSize // TODO: We might want to take minimum sizes into account
else
Result := TotalSize;
end;
function TCumulativeSizes.Validate(Index: TInteger32): TInteger32;
begin
if Index >= Count then
Result := Count - 1
else if (Index < 0) and (Count > 0) then
Result := 0
else
Result := Index;
end;
function TCumulativeSizes.ValidItemWithPosition(Position: TInteger32): TInteger32;
begin
Result := IndexWithRunningSum(Position);
if Result >= Count then
Result := Count - 1
else if Result < 0 then
Result := 0;
end;
function TCumulativeSizes.VisibleCount: TInteger32;
begin
Result := LastVisible - FirstVisible + 1;
end;
end.
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