author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 07:56:43 +0200 | |
changeset 0 | 15bf7259bb7c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Definition of THuiMetric, which is used to achieve |
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* text size dependent layouts, normalized child coordinate system and |
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* unified metrics system for all layout calculations. |
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* |
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*/ |
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#ifndef __HUIMETRIC_H__ |
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#define __HUIMETRIC_H__ |
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#include <e32base.h> |
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#include <e32std.h> |
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#include <uiacceltk/huitextstylemanager.h> |
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#include <uiacceltk/HuiRealPoint.h> |
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/** |
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* Metric units. The unit defines how the @c iMagnitude member of the THuiMetric |
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* struct is interpreted in practice. The interpretation may be dependent on |
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* the size of the layout where it is being used, the size of a font, or |
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* for example a globally defined constant. |
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*/ |
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enum THuiUnit |
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{ |
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/** Real pixel that corresponds the pixels on the physical device screen. */ |
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EHuiUnitPixel, |
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/** Normalized to parent layout size (0.0 -- 1.0). */ |
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EHuiUnitNormalized, |
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EHuiUnitParentSize = EHuiUnitNormalized, |
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/** Relative to the display where the metric is being used (0.0 -- 1.0). */ |
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EHuiUnitRelativeToDisplay, |
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EHuiUnitDisplaySize = EHuiUnitRelativeToDisplay, |
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/** |
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* Layout unit defined by S60 for a particular display device. |
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* @see CHuiDisplay::UnitValue |
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*/ |
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EHuiUnitS60, |
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/** |
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* Relative to the size of the visual where the metric is being used (0.0 -- 1.0). |
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* This is particularly useful for anchor layout offsets, and for paddings. |
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*/ |
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EHuiUnitRelativeToMySize, |
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EHuiUnitMySize = EHuiUnitRelativeToMySize, |
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/** relative weight; interpretation depends on sibling elements |
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* (for example, cells in a grid) |
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*/ |
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EHuiUnitWeight, |
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/** |
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* Not supported at the moment. |
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* Line height of the font of the reference text style (the "em width") |
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*/ |
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EHuiUnitLine, |
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/** |
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* Not Supported at the moment. |
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* Physical millimeters on the screen (for instance for icons). |
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*/ |
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EHuiUnitMillimeter, |
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/** |
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* Similar to EHuiUnitMysize. Can be used for example to constrain the aspect ratio of a visual, |
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* by constraining one axis to be defined in relation to its orthogonal axis. |
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*/ |
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EHuiUnitMyWidth, |
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EHuiUnitMyHeight, |
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|
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/** |
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* Similar to EHuiUnitNormalized. Can be used for example to constrain the aspect ratio of a visual |
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* by constraining one axis to be defined in relation to its parent's orthogonal axis. |
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*/ |
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EHuiUnitParentWidth, |
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EHuiUnitParentHeight, |
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/** |
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* Not Supported at the moment. |
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* Similar to EHuiUnitMysize. The minimum of a visual's dimensions. |
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*/ |
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EHuiUnitMyDimensionMinimum, |
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/** |
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* Similar to EHuiUnitMysize. The Average of a visual's dimensions. |
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*/ |
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EHuiUnitMyDimensionAverage, |
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}; |
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/** |
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* A Metric is used to represent a value in a specified unit type. This is |
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* to support the definition of Layouts using screen-size independent as well |
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* as screen-size dependent measurements. |
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* |
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* The metrics are used for different things in different contexts: |
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* coordinate base units, anchor offsets, grid column/row weights, paddings, etc. |
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* The interpretation of the units used in the metric depends on the context, |
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* the type of Layout in which they are used, etc. |
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* |
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*/ |
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struct THuiMetric |
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{ |
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public: |
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/** |
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* Constructor. The constructor defaults to using [1px] units. |
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* |
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* @param aMagnitude the size of the metric value, for example it may represent a length or a scale factor |
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* @param aUnit the unit type in which the metric value is represented |
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* @param aReferenceTextStyleID can be used to specify a text style in the case of EHuiUnitLine. |
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*/ |
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IMPORT_C THuiMetric(TReal32 aMagnitude = 1.f, TInt aUnit = EHuiUnitPixel, TInt aReferenceTextStyleId = EHuiTextStyleNormal) __SOFTFP; |
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/** |
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* Constructor. Allows the compiler to pass integers instead of THuiMetric |
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* in parameters, in place of pixel metrics. |
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* |
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* @param aPixels Number of pixels for the metric. |
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*/ |
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IMPORT_C THuiMetric(TInt aPixels); |
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/** |
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* Returns a copy of the metric with the absolute value of the magnitude component. |
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*/ |
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inline THuiMetric Abs() const |
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{ |
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return THuiMetric(::Abs(iMagnitude), iUnit, iReferenceTextStyleId); |
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} |
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inline THuiMetric operator * (TReal32 aValue) const |
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{ |
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THuiMetric result = *this; |
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result.iMagnitude *= aValue; |
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return result; |
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} |
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public: |
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TReal32 iMagnitude; |
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/** |
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* @see THuiUnit |
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*/ |
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TInt iUnit; |
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/** |
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* @see CHuiTextStyleManager::TextStyle |
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*/ |
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TInt iReferenceTextStyleId; |
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private: |
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TInt iSpare1; |
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TInt iSpare2; |
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}; |
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/** |
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* A pair of metrics used to represent a value in both X and Y directions, similar to a THuiRealPoint. |
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*/ |
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struct THuiXYMetric |
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{ |
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public: |
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/** |
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* Constructor. |
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*/ |
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IMPORT_C THuiXYMetric(); |
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/** |
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* Constructor. Uses the same metric for both axes. |
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* |
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* @param aMetric Metric for the X and Y axes. |
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*/ |
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IMPORT_C THuiXYMetric(const THuiMetric& aMetric); |
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/** |
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* Constructor. |
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* |
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* @param aX metric for the X axis |
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* @param aY metric for the Y axis |
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*/ |
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IMPORT_C THuiXYMetric(const THuiMetric& aX, const THuiMetric& aY); |
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inline THuiXYMetric operator * (const THuiRealPoint& aPoint) const |
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{ |
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THuiXYMetric result = *this; |
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result.iX.iMagnitude *= aPoint.iX; |
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result.iY.iMagnitude *= aPoint.iY; |
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return result; |
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} |
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inline THuiXYMetric Abs() const |
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{ |
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return THuiXYMetric(iX.Abs(), iY.Abs()); |
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} |
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public: |
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THuiMetric iX; |
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THuiMetric iY; |
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private: |
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TInt iSpare1; |
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TInt iSpare2; |
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}; |
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/** |
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* Four metrics used to indicate space around the four edges of a rectangle. |
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* Not called a rectangle because those are typically made up of two XY points, |
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* while this contains just four edge metrics (named top, bottom, left, and right). |
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*/ |
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struct THuiBoxMetric |
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{ |
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public: |
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/** |
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* Constructor. |
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*/ |
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IMPORT_C THuiBoxMetric(); |
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/** |
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* Constructor. Uses the same metric on all sides of the box. |
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* |
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* @param aMetric Metric for all sides of the box. |
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*/ |
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IMPORT_C THuiBoxMetric(const THuiMetric& aMetric); |
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/** |
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* Constructor. The X metric is used for the left and right sides, and the |
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* Y metric is used for the top and bottom sides. |
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* |
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* @param aMetric Metric for all sides of the box. |
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*/ |
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IMPORT_C THuiBoxMetric(const THuiXYMetric& aMetric); |
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/** |
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* Constructor. The top and left edges are specified in a single parameter, |
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* and the bottom and right edges are also specified in a single parameter. |
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* |
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* @param aTopLeft Metrics for the left and top sides. |
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* @param aBottomRight Metrics for the right and bottom sides. |
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*/ |
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IMPORT_C THuiBoxMetric(const THuiXYMetric& aTopLeft, |
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const THuiXYMetric& aBottomRight); |
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/** |
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* Constructor. |
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* |
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* @param aLeft Metric for the left edge of the box. |
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* @param aRight Metric for the right edge of the box. |
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* @param aTop Metric for the top edge of the box. |
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* @param aBottom Metric for the bottom edge of the box. |
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*/ |
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IMPORT_C THuiBoxMetric(const THuiMetric& aLeft, const THuiMetric& aRight, |
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const THuiMetric& aTop, const THuiMetric& aBottom); |
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public: |
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THuiMetric iLeft; |
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THuiMetric iRight; |
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THuiMetric iTop; |
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THuiMetric iBottom; |
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private: |
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TInt iSpare1; |
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TInt iSpare2; |
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}; |
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#endif // __HUIMETRIC_H__ |