1 // Copyright (C) 2002-2012 Nikolaus Gebhardt
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2 // This file is part of the "Irrlicht Engine".
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3 // For conditions of distribution and use, see copyright notice in irrlicht.h
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5 #ifndef __I_GUI_ENVIRONMENT_H_INCLUDED__
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6 #define __I_GUI_ENVIRONMENT_H_INCLUDED__
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8 #include "IReferenceCounted.h"
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9 #include "IGUISkin.h"
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11 #include "EFocusFlags.h"
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12 #include "IEventReceiver.h"
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18 class IEventReceiver;
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25 } // end namespace io
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30 } // end namespace video
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37 class IGUISpriteBank;
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38 class IGUIScrollBar;
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42 class IGUIImageList;
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43 class IGUIFileOpenDialog;
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44 class IGUIStaticText;
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46 class IGUITabControl;
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52 //! GUI Environment. Used as factory and manager of all other GUI elements.
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53 /** \par This element can create the following events of type EGUI_EVENT_TYPE (which are passed on to focused sub-elements):
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54 \li EGET_ELEMENT_FOCUS_LOST
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55 \li EGET_ELEMENT_FOCUSED
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56 \li EGET_ELEMENT_LEFT
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57 \li EGET_ELEMENT_HOVERED
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59 class IGUIEnvironment : public virtual IReferenceCounted
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63 //! Draws all gui elements by traversing the GUI environment starting at the root node.
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64 /** \param When true ensure the GuiEnvironment (aka the RootGUIElement) has the same size as the current driver screensize.
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65 Can be set to false to control that size yourself, p.E when not the full size should be used for UI. */
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66 virtual void drawAll(bool useScreenSize=true) = 0;
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68 //! Sets the focus to an element.
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69 /** Causes a EGET_ELEMENT_FOCUS_LOST event followed by a
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70 EGET_ELEMENT_FOCUSED event. If someone absorbed either of the events,
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71 then the focus will not be changed.
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72 \param element Pointer to the element which shall get the focus.
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73 \return True on success, false on failure */
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74 virtual bool setFocus(IGUIElement* element) = 0;
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76 //! Returns the element which holds the focus.
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77 /** \return Pointer to the element with focus. */
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78 virtual IGUIElement* getFocus() const = 0;
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80 //! Returns the element which was last under the mouse cursor
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81 /** NOTE: This information is updated _after_ the user-eventreceiver
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82 received it's mouse-events. To find the hovered element while catching
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83 mouse events you have to use instead:
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84 IGUIEnvironment::getRootGUIElement()->getElementFromPoint(mousePos);
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85 \return Pointer to the element under the mouse. */
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86 virtual IGUIElement* getHovered() const = 0;
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88 //! Removes the focus from an element.
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89 /** Causes a EGET_ELEMENT_FOCUS_LOST event. If the event is absorbed
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90 then the focus will not be changed.
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91 \param element Pointer to the element which shall lose the focus.
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92 \return True on success, false on failure */
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93 virtual bool removeFocus(IGUIElement* element) = 0;
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95 //! Returns whether the element has focus
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96 /** \param element Pointer to the element which is tested.
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97 \param checkSubElements When true and focus is on a sub-element of element then it will still count as focused and return true
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98 \return True if the element has focus, else false. */
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99 virtual bool hasFocus(const IGUIElement* element, bool checkSubElements=false) const = 0;
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101 //! Returns the current video driver.
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102 /** \return Pointer to the video driver. */
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103 virtual video::IVideoDriver* getVideoDriver() const = 0;
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105 //! Returns the file system.
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106 /** \return Pointer to the file system. */
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107 virtual io::IFileSystem* getFileSystem() const = 0;
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109 //! returns a pointer to the OS operator
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110 /** \return Pointer to the OS operator. */
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111 virtual IOSOperator* getOSOperator() const = 0;
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113 //! Removes all elements from the environment.
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114 virtual void clear() = 0;
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116 //! Posts an input event to the environment.
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117 /** Usually you do not have to
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118 use this method, it is used by the engine internally.
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119 \param event The event to post.
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120 \return True if succeeded, else false. */
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121 virtual bool postEventFromUser(const SEvent& event) = 0;
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123 //! This sets a new event receiver for gui events.
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124 /** Usually you do not have to
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125 use this method, it is used by the engine internally.
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126 \param evr Pointer to the new receiver. */
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127 virtual void setUserEventReceiver(IEventReceiver* evr) = 0;
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129 //! Returns pointer to the current gui skin.
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130 /** \return Pointer to the GUI skin. */
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131 virtual IGUISkin* getSkin() const = 0;
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133 //! Sets a new GUI Skin
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134 /** You can use this to change the appearance of the whole GUI
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135 Environment. You can set one of the built-in skins or implement your
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136 own class derived from IGUISkin and enable it using this method.
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137 To set for example the built-in Windows classic skin, use the following
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140 gui::IGUISkin* newskin = environment->createSkin(gui::EGST_WINDOWS_CLASSIC);
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141 environment->setSkin(newskin);
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144 \param skin New skin to use.
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146 virtual void setSkin(IGUISkin* skin) = 0;
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148 //! Creates a new GUI Skin based on a template.
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149 /** Use setSkin() to set the created skin.
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150 \param type The type of the new skin.
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151 \return Pointer to the created skin.
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152 If you no longer need it, you should call IGUISkin::drop().
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153 See IReferenceCounted::drop() for more information. */
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154 virtual IGUISkin* createSkin(EGUI_SKIN_TYPE type) = 0;
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157 //! Creates the image list from the given texture.
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158 /** \param texture Texture to split into images
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159 \param imageSize Dimension of each image
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160 \param useAlphaChannel Flag whether alpha channel of the texture should be honored.
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161 \return Pointer to the font. Returns 0 if the font could not be loaded.
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162 This pointer should not be dropped. See IReferenceCounted::drop() for
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163 more information. */
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164 virtual IGUIImageList* createImageList( video::ITexture* texture,
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165 core::dimension2d<s32> imageSize,
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166 bool useAlphaChannel ) = 0;
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168 //! Returns pointer to the font with the specified filename.
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169 /** Loads the font if it was not loaded before.
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170 \param filename Filename of the Font.
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171 \return Pointer to the font. Returns 0 if the font could not be loaded.
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172 This pointer should not be dropped. See IReferenceCounted::drop() for
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173 more information. */
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174 virtual IGUIFont* getFont(const io::path& filename) = 0;
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176 //! Adds an externally loaded font to the font list.
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177 /** This method allows to attach an already loaded font to the list of
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178 existing fonts. The font is grabbed if non-null and adding was successful.
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179 \param name Name the font should be stored as.
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180 \param font Pointer to font to add.
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181 \return Pointer to the font stored. This can differ from given parameter if the name previously existed. */
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182 virtual IGUIFont* addFont(const io::path& name, IGUIFont* font) = 0;
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184 //! remove loaded font
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185 virtual void removeFont(IGUIFont* font) = 0;
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187 //! Returns the default built-in font.
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188 /** \return Pointer to the default built-in font.
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189 This pointer should not be dropped. See IReferenceCounted::drop() for
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190 more information. */
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191 virtual IGUIFont* getBuiltInFont() const = 0;
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193 //! Returns pointer to the sprite bank which was added with addEmptySpriteBank
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194 /** TODO: This should load files in the future, but not implemented so far.
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195 \param filename Name of a spritebank added with addEmptySpriteBank
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196 \return Pointer to the sprite bank. Returns 0 if it could not be loaded.
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197 This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
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198 virtual IGUISpriteBank* getSpriteBank(const io::path& filename) = 0;
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200 //! Adds an empty sprite bank to the manager
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201 /** \param name Name of the new sprite bank.
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202 \return Pointer to the sprite bank.
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203 This pointer should not be dropped. See IReferenceCounted::drop() for more information. */
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204 virtual IGUISpriteBank* addEmptySpriteBank(const io::path& name) = 0;
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206 //! Returns the root gui element.
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207 /** This is the first gui element, the (direct or indirect) parent of all
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208 other gui elements. It is a valid IGUIElement, with dimensions the same
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209 size as the screen.
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210 \return Pointer to the root element of the GUI. The returned pointer
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211 should not be dropped. See IReferenceCounted::drop() for more
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213 virtual IGUIElement* getRootGUIElement() = 0;
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215 //! Adds a button element.
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216 /** \param rectangle Rectangle specifying the borders of the button.
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217 \param parent Parent gui element of the button.
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218 \param id Id with which the gui element can be identified.
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219 \param text Text displayed on the button.
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220 \param tooltiptext Text displayed in the tooltip.
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221 \return Pointer to the created button. Returns 0 if an error occurred.
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222 This pointer should not be dropped. See IReferenceCounted::drop() for
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223 more information. */
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224 virtual IGUIButton* addButton(const core::rect<s32>& rectangle,
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225 IGUIElement* parent=0, s32 id=-1, const wchar_t* text=0, const wchar_t* tooltiptext = 0) = 0;
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227 //! Adds a scrollbar.
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228 /** \param horizontal Specifies if the scroll bar is drawn horizontal
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230 \param rectangle Rectangle specifying the borders of the scrollbar.
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231 \param parent Parent gui element of the scroll bar.
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232 \param id Id to identify the gui element.
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233 \return Pointer to the created scrollbar. Returns 0 if an error
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234 occurred. This pointer should not be dropped. See
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235 IReferenceCounted::drop() for more information. */
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236 virtual IGUIScrollBar* addScrollBar(bool horizontal, const core::rect<s32>& rectangle,
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237 IGUIElement* parent=0, s32 id=-1) = 0;
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239 //! Adds an image element.
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240 /** \param image Image to be displayed.
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241 \param pos Position of the image. The width and height of the image is
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242 taken from the image.
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243 \param useAlphaChannel Sets if the image should use the alpha channel
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244 of the texture to draw itself.
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245 \param parent Parent gui element of the image.
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246 \param id Id to identify the gui element.
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247 \param text Title text of the image (not displayed).
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248 \return Pointer to the created image element. Returns 0 if an error
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249 occurred. This pointer should not be dropped. See
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250 IReferenceCounted::drop() for more information. */
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251 virtual IGUIImage* addImage(video::ITexture* image, core::position2d<s32> pos,
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252 bool useAlphaChannel=true, IGUIElement* parent=0, s32 id=-1, const wchar_t* text=0) = 0;
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254 //! Adds an image element.
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255 /** Use IGUIImage::setImage later to set the image to be displayed.
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256 \param rectangle Rectangle specifying the borders of the image.
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257 \param parent Parent gui element of the image.
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258 \param id Id to identify the gui element.
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259 \param text Title text of the image (not displayed).
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260 \param useAlphaChannel Sets if the image should use the alpha channel
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261 of the texture to draw itself.
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262 \return Pointer to the created image element. Returns 0 if an error
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263 occurred. This pointer should not be dropped. See
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264 IReferenceCounted::drop() for more information. */
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265 virtual IGUIImage* addImage(const core::rect<s32>& rectangle,
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266 IGUIElement* parent=0, s32 id=-1, const wchar_t* text=0, bool useAlphaChannel=true) = 0;
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268 //! Adds a checkbox element.
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269 /** \param checked Define the initial state of the check box.
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270 \param rectangle Rectangle specifying the borders of the check box.
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271 \param parent Parent gui element of the check box.
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272 \param id Id to identify the gui element.
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273 \param text Title text of the check box.
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274 \return Pointer to the created check box. Returns 0 if an error
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275 occurred. This pointer should not be dropped. See
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276 IReferenceCounted::drop() for more information. */
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277 virtual IGUICheckBox* addCheckBox(bool checked, const core::rect<s32>& rectangle,
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278 IGUIElement* parent=0, s32 id=-1, const wchar_t* text=0) = 0;
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280 //! Adds a list box element.
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281 /** \param rectangle Rectangle specifying the borders of the list box.
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282 \param parent Parent gui element of the list box.
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283 \param id Id to identify the gui element.
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284 \param drawBackground Flag whether the background should be drawn.
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285 \return Pointer to the created list box. Returns 0 if an error occurred.
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286 This pointer should not be dropped. See IReferenceCounted::drop() for
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287 more information. */
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288 virtual IGUIListBox* addListBox(const core::rect<s32>& rectangle,
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289 IGUIElement* parent=0, s32 id=-1, bool drawBackground=false) = 0;
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291 //! Adds a file open dialog.
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292 /** \param title Text to be displayed as the title of the dialog.
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293 \param modal Defines if the dialog is modal. This means, that all other
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294 gui elements which were created before the message box cannot be used
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295 until this messagebox is removed.
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296 \param parent Parent gui element of the dialog.
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297 \param id Id to identify the gui element.
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298 \param restoreCWD If set to true, the current working directory will be
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299 restored after the dialog is closed in some way. Otherwise the working
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300 directory will be the one that the file dialog was last showing.
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301 \param startDir Optional path for which the file dialog will be opened.
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302 \return Pointer to the created file open dialog. Returns 0 if an error
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303 occurred. This pointer should not be dropped. See
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304 IReferenceCounted::drop() for more information. */
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305 virtual IGUIFileOpenDialog* addFileOpenDialog(const wchar_t* title=0,
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306 bool modal=true, IGUIElement* parent=0, s32 id=-1,
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307 bool restoreCWD=false, io::path::char_type* startDir=0) = 0;
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309 //! Adds a static text.
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310 /** \param text Text to be displayed. Can be altered after creation by SetText().
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311 \param rectangle Rectangle specifying the borders of the static text
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312 \param border Set to true if the static text should have a 3d border.
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313 \param wordWrap Enable if the text should wrap into multiple lines.
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314 \param parent Parent item of the element, e.g. a window.
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315 \param id The ID of the element.
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316 \param fillBackground Enable if the background shall be filled.
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318 \return Pointer to the created static text. Returns 0 if an error
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319 occurred. This pointer should not be dropped. See
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320 IReferenceCounted::drop() for more information. */
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321 virtual IGUIStaticText* addStaticText(const wchar_t* text, const core::rect<s32>& rectangle,
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322 bool border=false, bool wordWrap=true, IGUIElement* parent=0, s32 id=-1,
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323 bool fillBackground = false) = 0;
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325 //! Adds an edit box.
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326 /** Supports Unicode input from every keyboard around the world,
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327 scrolling, copying and pasting (exchanging data with the clipboard
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328 directly), maximum character amount, marking, and all shortcuts like
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329 ctrl+X, ctrl+V, ctrl+C, shift+Left, shift+Right, Home, End, and so on.
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330 \param text Text to be displayed. Can be altered after creation
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332 \param rectangle Rectangle specifying the borders of the edit box.
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333 \param border Set to true if the edit box should have a 3d border.
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334 \param parent Parent item of the element, e.g. a window.
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335 Set it to 0 to place the edit box directly in the environment.
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336 \param id The ID of the element.
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337 \return Pointer to the created edit box. Returns 0 if an error occurred.
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338 This pointer should not be dropped. See IReferenceCounted::drop() for
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339 more information. */
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340 virtual IGUIEditBox* addEditBox(const wchar_t* text, const core::rect<s32>& rectangle,
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341 bool border=true, IGUIElement* parent=0, s32 id=-1) = 0;
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343 //! Adds a tab control to the environment.
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344 /** \param rectangle Rectangle specifying the borders of the tab control.
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345 \param parent Parent item of the element, e.g. a window.
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346 Set it to 0 to place the tab control directly in the environment.
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347 \param fillbackground Specifies if the background of the tab control
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349 \param border Specifies if a flat 3d border should be drawn. This is
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350 usually not necessary unless you place the control directly into
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351 the environment without a window as parent.
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352 \param id An identifier for the tab control.
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353 \return Pointer to the created tab control element. Returns 0 if an
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354 error occurred. This pointer should not be dropped. See
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355 IReferenceCounted::drop() for more information. */
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356 virtual IGUITabControl* addTabControl(const core::rect<s32>& rectangle,
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357 IGUIElement* parent=0, bool fillbackground=false,
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358 bool border=true, s32 id=-1) = 0;
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360 //! Adds tab to the environment.
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361 /** You can use this element to group other elements. This is not used
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362 for creating tabs on tab controls, please use IGUITabControl::addTab()
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364 \param rectangle Rectangle specifying the borders of the tab.
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365 \param parent Parent item of the element, e.g. a window.
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366 Set it to 0 to place the tab directly in the environment.
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367 \param id An identifier for the tab.
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368 \return Pointer to the created tab. Returns 0 if an
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369 error occurred. This pointer should not be dropped. See
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370 IReferenceCounted::drop() for more information. */
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371 virtual IGUITab* addTab(const core::rect<s32>& rectangle,
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372 IGUIElement* parent=0, s32 id=-1) = 0;
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374 //! Adds a combo box to the environment.
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375 /** \param rectangle Rectangle specifying the borders of the combo box.
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376 \param parent Parent item of the element, e.g. a window.
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377 Set it to 0 to place the combo box directly in the environment.
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378 \param id An identifier for the combo box.
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379 \return Pointer to the created combo box. Returns 0 if an
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380 error occurred. This pointer should not be dropped. See
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381 IReferenceCounted::drop() for more information. */
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382 virtual IGUIComboBox* addComboBox(const core::rect<s32>& rectangle,
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383 IGUIElement* parent=0, s32 id=-1) = 0;
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385 //! Find the next element which would be selected when pressing the tab-key
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386 /** If you set the focus for the result you can manually force focus-changes like they
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387 would happen otherwise by the tab-keys.
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388 \param reverse When true it will search backward (toward lower TabOrder numbers, like shift+tab)
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389 \param group When true it will search for the next tab-group (like ctrl+tab)
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391 virtual IGUIElement* getNextElement(bool reverse=false, bool group=false) = 0;
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393 //! Set the way the gui will handle automatic focus changes
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394 /** The default is (EFF_SET_ON_LMOUSE_DOWN | EFF_SET_ON_TAB).
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395 with the left mouse button.
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396 This does not affect the setFocus function itself - users can still call that whenever they want on any element.
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397 \param flags A bitmask which is a combination of ::EFOCUS_FLAG flags.*/
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398 virtual void setFocusBehavior(u32 flags) = 0;
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400 //! Get the way the gui does handle focus changes
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401 /** \returns A bitmask which is a combination of ::EFOCUS_FLAG flags.*/
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402 virtual u32 getFocusBehavior() const = 0;
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404 //! Adds a IGUIElement to deletion queue.
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405 /** Queued elements will be removed at the end of each drawAll call.
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406 Or latest in the destructor of the GUIEnvironment.
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407 This can be used to allow an element removing itself safely in a function
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408 iterating over gui elements, like an overloaded IGUIElement::draw or
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409 IGUIElement::OnPostRender function.
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410 Note that in general just calling IGUIElement::remove() is enough.
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411 Unless you create your own GUI elements removing themselves you won't need it.
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412 \param element: Element to remove */
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413 virtual void addToDeletionQueue(IGUIElement* element) = 0;
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417 } // end namespace gui
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418 } // end namespace irr
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