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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: CastleControls: Class TCastleButton</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TCastleButton"></a><h1 class="cio">Class TCastleButton</h1>
<table class="sections wide_list">
<tr>
<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td><a class="section" href="#PasDoc-Fields">Fields</a></td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="CastleControls.html">CastleControls</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TCastleButton = class(<a class="normal" href="CastleControls.TUIControlFont.html">TUIControlFont</a>)</code></p>
<h2 class="description">Description</h2>
<p>
Button inside OpenGL context.
<p>This is <a class="normal" href="CastleUIControls.TUIControl.html">TUIControl</a> descendant, so to use it just add it to the <a class="normal" href="CastleWindow.TCastleWindowCustom.html#Controls">TCastleWindowCustom.Controls</a> or <a class="normal" href="CastleControl.TCastleControlCustom.html#Controls">TCastleControlCustom.Controls</a> list. You will also usually want to adjust position (TCastleButton.Left, TCastleButton.Bottom), <a class="normal" href="CastleControls.TCastleButton.html#Caption">TCastleButton.Caption</a>, and assign <a class="normal" href="CastleControls.TCastleButton.html#OnClick">TCastleButton.OnClick</a> (or ovevrride <a class="normal" href="CastleControls.TCastleButton.html#DoClick">TCastleButton.DoClick</a>).</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TComponent</li>
<li class="ancestor"><a class="normal" href="CastleUIControls.TInputListener.html">TInputListener</a></li>
<li class="ancestor"><a class="normal" href="CastleUIControls.TUIControl.html">TUIControl</a></li>
<li class="ancestor"><a class="normal" href="CastleUIControls.TUIRectangularControl.html">TUIRectangularControl</a></li>
<li class="ancestor"><a class="normal" href="CastleControls.TUIControlFont.html">TUIControlFont</a></li>
<li class="thisitem">TCastleButton</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Fields"></a><h3 class="summary">Fields</h3>
<table class="summary wide_list">
<tr class="list">
<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>internal const <b><a href="CastleControls.TCastleButton.html#DefaultImageMargin">DefaultImageMargin</a></b> = 10;</code></td>
</tr>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>internal const <b><a href="CastleControls.TCastleButton.html#DefaultPaddingHorizontal">DefaultPaddingHorizontal</a></b> = 10;</code></td>
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<td class="itemcode"><code>internal const <b><a href="CastleControls.TCastleButton.html#DefaultPaddingVertical">DefaultPaddingVertical</a></b> = 10;</code></td>
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<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#FontChanged">FontChanged</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>constructor <b><a href="CastleControls.TCastleButton.html#Create">Create</a></b>(AOwner: TComponent); override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>destructor <b><a href="CastleControls.TCastleButton.html#Destroy">Destroy</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#Render">Render</a></b>; override;</code></td>
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<td class="itemcode"><code>function <b><a href="CastleControls.TCastleButton.html#PositionInside">PositionInside</a></b>(const Position: <a href="CastleVectors.html#TVector2Single">TVector2Single</a>): boolean; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#GLContextOpen">GLContextOpen</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#GLContextClose">GLContextClose</a></b>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="CastleControls.TCastleButton.html#Press">Press</a></b>(const Event: <a href="CastleKeysMouse.TInputPressRelease.html">TInputPressRelease</a>): boolean; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="CastleControls.TCastleButton.html#Release">Release</a></b>(const Event: <a href="CastleKeysMouse.TInputPressRelease.html">TInputPressRelease</a>): boolean; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>function <b><a href="CastleControls.TCastleButton.html#Rect">Rect</a></b>: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; override;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#DoClick">DoClick</a></b>; virtual;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>procedure <b><a href="CastleControls.TCastleButton.html#SetFocused">SetFocused</a></b>(const Value: boolean); override;</code></td>
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<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Image">Image</a></b>: <a href="CastleImages.TCastleImage.html">TCastleImage</a> read FImage write SetImage;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#OwnsImage">OwnsImage</a></b>: boolean read FOwnsImage write FOwnsImage default false;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#MinImageWidth">MinImageWidth</a></b>: Cardinal read FMinImageWidth write FMinImageWidth default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#MinImageHeight">MinImageHeight</a></b>: Cardinal read FMinImageHeight write FMinImageHeight default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Width">Width</a></b>: Cardinal read FWidth write SetWidth default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Height">Height</a></b>: Cardinal read FHeight write SetHeight default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#PaddingHorizontal">PaddingHorizontal</a></b>: Cardinal
read FPaddingHorizontal write FPaddingHorizontal default <a href="CastleControls.TCastleButton.html#DefaultPaddingHorizontal">DefaultPaddingHorizontal</a>;</code></td>
</tr>
<tr class="list2">
<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#PaddingVertical">PaddingVertical</a></b>: Cardinal
read FPaddingVertical write FPaddingVertical default <a href="CastleControls.TCastleButton.html#DefaultPaddingVertical">DefaultPaddingVertical</a>;</code></td>
</tr>
<tr class="list">
<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#AutoSize">AutoSize</a></b>: boolean read FAutoSize write SetAutoSize default true;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#AutoSizeWidth">AutoSizeWidth</a></b>: boolean read FAutoSizeWidth write SetAutoSizeWidth default true;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#AutoSizeHeight">AutoSizeHeight</a></b>: boolean read FAutoSizeHeight write SetAutoSizeHeight default true;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#MinWidth">MinWidth</a></b>: Cardinal read FMinWidth write SetMinWidth default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#MinHeight">MinHeight</a></b>: Cardinal read FMinHeight write SetMinHeight default 0;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#OnClick">OnClick</a></b>: TNotifyEvent read FOnClick write FOnClick;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Caption">Caption</a></b>: string read FCaption write SetCaption;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Toggle">Toggle</a></b>: boolean read FToggle write FToggle default false;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#Pressed">Pressed</a></b>: boolean read FPressed write SetPressed default false;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#ImageLayout">ImageLayout</a></b>: <a href="CastleControls.html#TCastleButtonImageLayout">TCastleButtonImageLayout</a>
read FImageLayout write SetImageLayout default ilLeft;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#ImageAlphaTest">ImageAlphaTest</a></b>: boolean
read FImageAlphaTest write FImageAlphaTest default false;</code></td>
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<td class="visibility"><a href="legend.html"><img src="published.gif" alt="Published" title="Published"></a></td>
<td class="itemcode"><code>property <b><a href="CastleControls.TCastleButton.html#ImageMargin">ImageMargin</a></b>: Cardinal read FImageMargin write SetImageMargin
default <a href="CastleControls.TCastleButton.html#DefaultImageMargin">DefaultImageMargin</a>;</code></td>
</tr>
</table>
<h2 class="description">Description</h2>
<h3 class="detail">Fields</h3>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="DefaultImageMargin"></a><code>internal const <b>DefaultImageMargin</b> = 10;</code></td>
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<td class="visibility"><a href="legend.html"><img src="public.gif" alt="Public" title="Public"></a></td>
<td class="itemcode"><a name="DefaultPaddingHorizontal"></a><code>internal const <b>DefaultPaddingHorizontal</b> = 10;</code></td>
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<td class="itemcode"><a name="DefaultPaddingVertical"></a><code>internal const <b>DefaultPaddingVertical</b> = 10;</code></td>
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<h3 class="detail">Methods</h3>
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<td class="visibility"><a href="legend.html"><img src="protected.gif" alt="Protected" title="Protected"></a></td>
<td class="itemcode"><a name="FontChanged"></a><code>procedure <b>FontChanged</b>; override;</code></td>
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<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(AOwner: TComponent); override;</code></td>
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<td class="itemcode"><a name="Destroy"></a><code>destructor <b>Destroy</b>; override;</code></td>
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<td class="itemcode"><a name="Render"></a><code>procedure <b>Render</b>; override;</code></td>
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<td class="itemcode"><a name="PositionInside"></a><code>function <b>PositionInside</b>(const Position: <a href="CastleVectors.html#TVector2Single">TVector2Single</a>): boolean; override;</code></td>
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<td class="itemcode"><a name="GLContextOpen"></a><code>procedure <b>GLContextOpen</b>; override;</code></td>
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<td class="itemcode"><a name="GLContextClose"></a><code>procedure <b>GLContextClose</b>; override;</code></td>
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<td class="itemcode"><a name="Press"></a><code>function <b>Press</b>(const Event: <a href="CastleKeysMouse.TInputPressRelease.html">TInputPressRelease</a>): boolean; override;</code></td>
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<td class="itemcode"><a name="Release"></a><code>function <b>Release</b>(const Event: <a href="CastleKeysMouse.TInputPressRelease.html">TInputPressRelease</a>): boolean; override;</code></td>
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<td class="itemcode"><a name="Rect"></a><code>function <b>Rect</b>: <a href="CastleRectangles.TRectangle.html">TRectangle</a>; override;</code></td>
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<td class="itemcode"><a name="DoClick"></a><code>procedure <b>DoClick</b>; virtual;</code></td>
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Called when user clicks the button. In this class, simply calls <a class="normal" href="CastleControls.TCastleButton.html#OnClick">OnClick</a> callback.</p>
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<td class="itemcode"><a name="SetFocused"></a><code>procedure <b>SetFocused</b>(const Value: boolean); override;</code></td>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="Image"></a><code>property <b>Image</b>: <a href="CastleImages.TCastleImage.html">TCastleImage</a> read FImage write SetImage;</code></td>
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Set this to non-nil to display an image on the button.</p>
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<td class="itemcode"><a name="OwnsImage"></a><code>property <b>OwnsImage</b>: boolean read FOwnsImage write FOwnsImage default false;</code></td>
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Should we free the <a class="normal" href="CastleControls.TCastleButton.html#Image">Image</a> when you set another one or at destructor.</p>
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<td class="itemcode"><a name="MinImageWidth"></a><code>property <b>MinImageWidth</b>: Cardinal read FMinImageWidth write FMinImageWidth default 0;</code></td>
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Auto-size routines (see <a class="normal" href="CastleControls.TCastleButton.html#AutoSize">AutoSize</a>) may treat the image like always having at least these minimal sizes. Even if the <a class="normal" href="CastleControls.TCastleButton.html#Image">Image</a> is empty (<code>Nil</code>). This is useful when you have a row of buttons (typical for toolbar), and you want them to have the same height, and their captions to be displayed at the same level, regardless of their images sizes.</p>
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<td class="itemcode"><a name="MinImageHeight"></a><code>property <b>MinImageHeight</b>: Cardinal read FMinImageHeight write FMinImageHeight default 0;</code></td>
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<td class="itemcode"><a name="Width"></a><code>property <b>Width</b>: Cardinal read FWidth write SetWidth default 0;</code></td>
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<td class="itemcode"><a name="Height"></a><code>property <b>Height</b>: Cardinal read FHeight write SetHeight default 0;</code></td>
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<td class="itemcode"><a name="PaddingHorizontal"></a><code>property <b>PaddingHorizontal</b>: Cardinal
read FPaddingHorizontal write FPaddingHorizontal default <a href="CastleControls.TCastleButton.html#DefaultPaddingHorizontal">DefaultPaddingHorizontal</a>;</code></td>
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<td class="itemcode"><a name="PaddingVertical"></a><code>property <b>PaddingVertical</b>: Cardinal
read FPaddingVertical write FPaddingVertical default <a href="CastleControls.TCastleButton.html#DefaultPaddingVertical">DefaultPaddingVertical</a>;</code></td>
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<td class="itemcode"><a name="AutoSize"></a><code>property <b>AutoSize</b>: boolean read FAutoSize write SetAutoSize default true;</code></td>
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When <code>AutoSize</code> is <code>True</code> (the default) then Width/Height are automatically adjusted when you change the Caption and <a class="normal" href="CastleControls.TCastleButton.html#Image">Image</a>. They take into account Caption width/height with current font, <a class="normal" href="CastleControls.TCastleButton.html#Image">Image</a> width/height, and add some margin to make it look good.
<p>To be more precise, Width is adjusted only when <code>AutoSize</code> and <a class="normal" href="CastleControls.TCastleButton.html#AutoSizeWidth">AutoSizeWidth</a>. And Height is adjusted only when <code>AutoSize</code> and <a class="normal" href="CastleControls.TCastleButton.html#AutoSizeHeight">AutoSizeHeight</a>. This way you can turn off auto-sizing in only one dimension if you want (and when you don't need such flexibility, leave <a class="normal" href="CastleControls.TCastleButton.html#AutoSizeWidth">AutoSizeWidth</a> = <a class="normal" href="CastleControls.TCastleButton.html#AutoSizeHeight">AutoSizeHeight</a> = <code>True</code> and control both by simple <code>AutoSize</code>).
<p>Note that this adjustment happens only when OpenGL context is initialized (because only then we actually know the font used). So don't depend on Width/Height values calculated correctly before OpenGL context is ready.</p>
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<td class="itemcode"><a name="AutoSizeWidth"></a><code>property <b>AutoSizeWidth</b>: boolean read FAutoSizeWidth write SetAutoSizeWidth default true;</code></td>
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<td class="itemcode"><a name="AutoSizeHeight"></a><code>property <b>AutoSizeHeight</b>: boolean read FAutoSizeHeight write SetAutoSizeHeight default true;</code></td>
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<td class="itemcode"><a name="MinWidth"></a><code>property <b>MinWidth</b>: Cardinal read FMinWidth write SetMinWidth default 0;</code></td>
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When auto-size is in effect, these properties may force a minimal width/height of the button. This is useful if you want to use auto-size (to make sure that the content fits inside), but you want to force filling some space.</p>
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<td class="itemcode"><a name="MinHeight"></a><code>property <b>MinHeight</b>: Cardinal read FMinHeight write SetMinHeight default 0;</code></td>
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<td class="itemcode"><a name="OnClick"></a><code>property <b>OnClick</b>: TNotifyEvent read FOnClick write FOnClick;</code></td>
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<td class="itemcode"><a name="Caption"></a><code>property <b>Caption</b>: string read FCaption write SetCaption;</code></td>
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<td class="itemcode"><a name="Toggle"></a><code>property <b>Toggle</b>: boolean read FToggle write FToggle default false;</code></td>
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Can the button be permanently pressed. Good for making a button behave like a checkbox, that is indicate a boolean state. When <a class="normal" href="CastleControls.TCastleButton.html#Toggle">Toggle</a> is <code>True</code>, you can set the <a class="normal" href="CastleControls.TCastleButton.html#Pressed">Pressed</a> property, and the clicks are visualized a little differently.</p>
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<td class="itemcode"><a name="Pressed"></a><code>property <b>Pressed</b>: boolean read FPressed write SetPressed default false;</code></td>
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Is the button pressed down. If <a class="normal" href="CastleControls.TCastleButton.html#Toggle">Toggle</a> is <code>True</code>, you can read and write this property to set the pressed state.
<p>When not <a class="normal" href="CastleControls.TCastleButton.html#Toggle">Toggle</a>, this property isn't really useful to you. The pressed state is automatically managed then to visualize user clicks. In this case, you can read this property, but you cannot reliably set it.</p>
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<td class="itemcode"><a name="ImageLayout"></a><code>property <b>ImageLayout</b>: <a href="CastleControls.html#TCastleButtonImageLayout">TCastleButtonImageLayout</a>
read FImageLayout write SetImageLayout default ilLeft;</code></td>
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Where the <a class="normal" href="CastleControls.TCastleButton.html#Image">Image</a> is drawn on a button.</p>
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<td class="itemcode"><a name="ImageAlphaTest"></a><code>property <b>ImageAlphaTest</b>: boolean
read FImageAlphaTest write FImageAlphaTest default false;</code></td>
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If the image has alpha channel, should we render with alpha test (simple yes/no transparency) or alpha blending (smootly mix with background using full transparency).</p>
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<td class="itemcode"><a name="ImageMargin"></a><code>property <b>ImageMargin</b>: Cardinal read FImageMargin write SetImageMargin
default <a href="CastleControls.TCastleButton.html#DefaultImageMargin">DefaultImageMargin</a>;</code></td>
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