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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 UserInterface.Navigation;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Geometry._2d.Side,
UserInterface.Keyboard.Key,
UserInterface.Keyboard.Modifiers;
type
TNavigationDirection = (
None,
Left,
Right,
Up,
Down,
Forward,
Backward,
VerticalHome,
VerticalEnd,
HorizontalHome,
HorizontalEnd,
PageUp,
PageDown,
PageLeft,
PageRight,
Parent,
Child
);
TNavigationDimension = (None, Horizontal, Vertical);
TValidNavigationDimension = TNavigationDimension.Horizontal..TNavigationDimension.Vertical;
function IsNavigationKey(Key: TKey): TBoolean;
function KeyToNavigation(Key: TKey; KeyModifiers: TKeyModifiers): TNavigationDirection;
function NavigationDirectionToSide(Direction: TNavigationDirection): TSide;
function InverseNavigationDirection(Direction: TNavigationDirection): TNavigationDirection;
function NavigationDirectionToDimension(Direction: TNavigationDirection): TNavigationDimension;
implementation
uses
Exception.Enumeration;
function IsNavigationKey(Key: TKey): TBoolean;
begin
Result := Key in [TKey.Tab, TKey.Right, TKey.Left, TKey.Up, TKey.Down, TKey.Home, TKey.End_, TKey.PageDown, TKey.PageUp, TKey.Escape];
end;
function KeyToNavigation(Key: TKey; KeyModifiers: TKeyModifiers): TNavigationDirection;
begin
case Key of
TKey.Tab:
if TKeyModifier.Shift in KeyModifiers then
Result := TNavigationDirection.Backward
else
Result := TNavigationDirection.Forward;
TKey.Home:
if TKeyModifier.Control in KeyModifiers then
Result := TNavigationDirection.VerticalHome
else
Result := TNavigationDirection.HorizontalHome;
TKey.End_:
if TKeyModifier.Control in KeyModifiers then
Result := TNavigationDirection.VerticalEnd
else
Result := TNavigationDirection.HorizontalEnd;
TKey.Up:
Result := TNavigationDirection.Up;
TKey.Down:
Result := TNavigationDirection.Down;
TKey.Left:
Result := TNavigationDirection.Left;
TKey.Right:
Result := TNavigationDirection.Right;
TKey.PageDown:
if TKeyModifier.Control in KeyModifiers then
Result := TNavigationDirection.PageRight
else
Result := TNavigationDirection.PageDown;
TKey.PageUp:
if TKeyModifier.Control in KeyModifiers then
Result := TNavigationDirection.PageLeft
else
Result := TNavigationDirection.PageUp;
TKey.OpenBracket:
Result := TNavigationDirection.Parent;
TKey.CloseBracket:
Result := TNavigationDirection.Child;
else
Result := TNavigationDirection.None;
end;
end;
function NavigationDirectionToSide(Direction: TNavigationDirection): TSide;
begin
case Direction of
TNavigationDirection.Left:
Result := sdLeft;
TNavigationDirection.Right:
Result := sdRight;
TNavigationDirection.Up:
Result := sdTop;
TNavigationDirection.Down:
Result := sdBottom;
TNavigationDirection.VerticalHome:
Result := sdVerticalBegin;
TNavigationDirection.VerticalEnd:
Result := sdVerticalEnd;
TNavigationDirection.HorizontalHome:
Result := sdHorizontalBegin;
TNavigationDirection.HorizontalEnd:
Result := sdHorizontalEnd;
else
raise EUnknownEnumerationValue.Create('Unknown direction');
end;
end;
function InverseNavigationDirection(Direction: TNavigationDirection): TNavigationDirection;
begin
case Direction of
TNavigationDirection.Left:
Result := TNavigationDirection.Right;
TNavigationDirection.Right:
Result := TNavigationDirection.Left;
TNavigationDirection.Up:
Result := TNavigationDirection.Down;
TNavigationDirection.Down:
Result := TNavigationDirection.Up;
TNavigationDirection.VerticalHome:
Result := TNavigationDirection.VerticalEnd;
TNavigationDirection.VerticalEnd:
Result := TNavigationDirection.VerticalHome;
TNavigationDirection.HorizontalHome:
Result := TNavigationDirection.HorizontalEnd;
TNavigationDirection.HorizontalEnd:
Result := TNavigationDirection.HorizontalHome;
TNavigationDirection.Parent:
Result := TNavigationDirection.Child;
TNavigationDirection.Child:
Result := TNavigationDirection.Parent;
else
raise EUnknownEnumerationValue.Create('Unknown direction');
end;
end;
function NavigationDirectionToDimension(Direction: TNavigationDirection): TNavigationDimension;
begin
if Direction in [TNavigationDirection.Left, TNavigationDirection.Right, TNavigationDirection.PageLeft, TNavigationDirection.PageRight, TNavigationDirection.HorizontalHome, TNavigationDirection.HorizontalEnd] then
Result := TNavigationDimension.Horizontal
else if Direction in [TNavigationDirection.Up, TNavigationDirection.Down, TNavigationDirection.PageUp, TNavigationDirection.PageDown, TNavigationDirection.VerticalHome, TNavigationDirection.VerticalEnd] then
Result := TNavigationDimension.Vertical
else
Result := TNavigationDimension.None;
end;
end.
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