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Andrew Zambazos
2026-06-11 14:02:39 +12:00
parent c0395a49bd
commit ffdc88608e
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include/Ultralight/CAPI/CAPI_View.h
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/**************************************************************************************************
* This file is a part of Ultralight, an ultra-portable web-browser engine. *
* *
* See <https://ultralig.ht> for licensing and more. *
* *
* (C) 2024 Ultralight, Inc. *
**************************************************************************************************/
///
/// @file CAPI_View.h
///
/// Web-page container rendered to an offscreen surface.
///
/// `#include <Ultralight/CAPI/CAPI_View.h>`
///
/// The View class is responsible for loading and rendering web-pages to an offscreen surface. It
/// is completely isolated from the OS windowing system, you must forward all input events to it
/// from your application.
///
/// ## Creating a View
///
/// You can create a View by calling ulCreateView():
///
/// ```
/// // Create a ULViewConfig with default values
/// ULViewConfig view_config = ulCreateViewConfig();
///
/// // Create a View, 500 by 500 pixels in size, using the default Session
/// ULView view = ulCreateView(renderer, 500, 500, view_config, NULL);
///
/// // Clean up the ULViewConfig
/// ulDestroyViewConfig(view_config);
/// ```
///
/// @note When using ulCreateApp(), the library will automatically create a View for you when you
/// call ulCreateOverlay().
///
#ifndef ULTRALIGHT_CAPI_VIEW_H
#define ULTRALIGHT_CAPI_VIEW_H
#include <Ultralight/CAPI/CAPI_Defines.h>
#ifdef __cplusplus
extern "C" {
#endif
/******************************************************************************
* ViewConfig
*****************************************************************************/
///
/// Create view configuration with default values (see <Ultralight/platform/View.h>).
///
ULExport ULViewConfig ulCreateViewConfig();
///
/// Destroy view configuration.
///
ULExport void ulDestroyViewConfig(ULViewConfig config);
///
/// Set a user-generated id of the display (monitor, TV, or screen) that the View will be shown on.
///
/// Animations are driven based on the physical refresh rate of the display. Multiple Views can
/// share the same display.
///
///
/// @note This is automatically managed for you when ulCreateApp() is used.
///
/// @see ulRefreshDisplay()
///
ULExport void ulViewConfigSetDisplayId(ULViewConfig config, unsigned int display_id);
///
/// Set whether to render using the GPU renderer (accelerated) or the CPU renderer (unaccelerated).
///
/// This option is only valid if you're managing the Renderer yourself (eg, you've previously
/// called ulCreateRenderer() instead of ulCreateApp()).
///
/// When true, the View will be rendered to an offscreen GPU texture using the GPU driver set in
/// ulPlatformSetGPUDriver(). You can fetch details for the texture via ulViewGetRenderTarget().
///
/// When false (the default), the View will be rendered to an offscreen pixel buffer using the
/// multithreaded CPU renderer. This pixel buffer can optionally be provided by the user--
/// for more info see ulViewGetSurface().
///
ULExport void ulViewConfigSetIsAccelerated(ULViewConfig config, bool is_accelerated);
///
/// Set whether images should be enabled (Default = True).
///
ULExport void ulViewConfigSetIsTransparent(ULViewConfig config, bool is_transparent);
///
/// Set the initial device scale, ie. the amount to scale page units to screen pixels. This should be
/// set to the scaling factor of the device that the View is displayed on. (Default = 1.0)
///
/// @note 1.0 is equal to 100% zoom (no scaling), 2.0 is equal to 200% zoom (2x scaling)
///
ULExport void ulViewConfigSetInitialDeviceScale(ULViewConfig config, double initial_device_scale);
///
/// Set whether or not the View should initially have input focus. (Default = True)
///
ULExport void ulViewConfigSetInitialFocus(ULViewConfig config, bool is_focused);
///
/// Set whether images should be enabled (Default = True).
///
ULExport void ulViewConfigSetEnableImages(ULViewConfig config, bool enabled);
///
/// Set whether JavaScript should be enabled (Default = True).
///
ULExport void ulViewConfigSetEnableJavaScript(ULViewConfig config, bool enabled);
///
/// Set default font-family to use (Default = Times New Roman).
///
ULExport void ulViewConfigSetFontFamilyStandard(ULViewConfig config, ULString font_name);
///
/// Set default font-family to use for fixed fonts, eg <pre> and <code>
/// (Default = Courier New).
///
ULExport void ulViewConfigSetFontFamilyFixed(ULViewConfig config, ULString font_name);
///
/// Set default font-family to use for serif fonts (Default = Times New Roman).
///
ULExport void ulViewConfigSetFontFamilySerif(ULViewConfig config, ULString font_name);
///
/// Set default font-family to use for sans-serif fonts (Default = Arial).
///
ULExport void ulViewConfigSetFontFamilySansSerif(ULViewConfig config, ULString font_name);
///
/// Set user agent string (See <Ultralight/platform/Config.h> for the default).
///
ULExport void ulViewConfigSetUserAgent(ULViewConfig config, ULString agent_string);
/******************************************************************************
* View
*****************************************************************************/
///
/// Create a View with certain size (in pixels).
///
/// @note You can pass null to 'session' to use the default session.
///
ULExport ULView ulCreateView(ULRenderer renderer, unsigned int width, unsigned int height,
ULViewConfig view_config, ULSession session);
///
/// Destroy a View.
///
ULExport void ulDestroyView(ULView view);
///
/// Get current URL.
///
/// @note Don't destroy the returned string, it is owned by the View.
///
ULExport ULString ulViewGetURL(ULView view);
///
/// Get current title.
///
/// @note Don't destroy the returned string, it is owned by the View.
///
ULExport ULString ulViewGetTitle(ULView view);
///
/// Get the width, in pixels.
///
ULExport unsigned int ulViewGetWidth(ULView view);
///
/// Get the height, in pixels.
///
ULExport unsigned int ulViewGetHeight(ULView view);
///
// Get the display id of the View.
///
ULExport unsigned int ulViewGetDisplayId(ULView view);
///
/// Set the display id of the View.
///
/// This should be called when the View is moved to another display.
///
ULExport void ulViewSetDisplayId(ULView view, unsigned int display_id);
///
/// Get the device scale, ie. the amount to scale page units to screen pixels.
///
/// For example, a value of 1.0 is equivalent to 100% zoom. A value of 2.0 is 200% zoom.
///
ULExport double ulViewGetDeviceScale(ULView view);
///
/// Set the device scale.
///
ULExport void ulViewSetDeviceScale(ULView view, double scale);
///
/// Whether or not the View is GPU-accelerated. If this is false, the page will be rendered
/// via the CPU renderer.
///
ULExport bool ulViewIsAccelerated(ULView view);
///
/// Whether or not the View supports transparent backgrounds.
///
ULExport bool ulViewIsTransparent(ULView view);
///
/// Check if the main frame of the page is currrently loading.
///
ULExport bool ulViewIsLoading(ULView view);
///
/// Get the RenderTarget for the View.
///
/// @note Only valid if this View is GPU accelerated.
///
/// You can use this with your GPUDriver implementation to bind and display the
/// corresponding texture in your application.
///
ULExport ULRenderTarget ulViewGetRenderTarget(ULView view);
///
/// Get the Surface for the View (native pixel buffer that the CPU renderer draws into).
///
/// @note This operation is only valid if you're managing the Renderer yourself (eg, you've
/// previously called ulCreateRenderer() instead of ulCreateApp()).
///
/// This function will return NULL if this View is GPU accelerated.
///
/// The default Surface is BitmapSurface but you can provide your own Surface implementation
/// via ulPlatformSetSurfaceDefinition.
///
/// When using the default Surface, you can retrieve the underlying bitmap by casting
/// ULSurface to ULBitmapSurface and calling ulBitmapSurfaceGetBitmap().
///
ULExport ULSurface ulViewGetSurface(ULView view);
///
/// Load a raw string of HTML.
///
ULExport void ulViewLoadHTML(ULView view, ULString html_string);
///
/// Load a URL into main frame.
///
ULExport void ulViewLoadURL(ULView view, ULString url_string);
///
/// Resize view to a certain width and height (in pixels).
///
ULExport void ulViewResize(ULView view, unsigned int width, unsigned int height);
///
/// Acquire the page's JSContext for use with JavaScriptCore API.
///
/// @note This call locks the context for the current thread. You should call
/// ulViewUnlockJSContext() after using the context so other worker threads can modify
/// JavaScript state.
///
/// @note The lock is recusive, it's okay to call this multiple times as long as you call
/// ulViewUnlockJSContext() the same number of times.
///
ULExport JSContextRef ulViewLockJSContext(ULView view);
///
/// Unlock the page's JSContext after a previous call to ulViewLockJSContext().
///
ULExport void ulViewUnlockJSContext(ULView view);
///
/// Evaluate a string of JavaScript and return result.
///
/// @param js_string The string of JavaScript to evaluate.
///
/// @param exception The address of a ULString to store a description of the last exception. Pass
/// NULL to ignore this. Don't destroy the exception string returned, it's owned
/// by the View.
///
/// @note Don't destroy the returned string, it's owned by the View. This value is reset with every
/// call-- if you want to retain it you should copy the result to a new string via
/// ulCreateStringFromCopy().
///
/// @note An example of using this API:
/// <pre>
/// ULString script = ulCreateString("1 + 1");
/// ULString exception;
/// ULString result = ulViewEvaluateScript(view, script, &exception);
/// /* Use the result ("2") and exception description (if any) here. */
/// ulDestroyString(script);
/// </pre>
///
ULExport ULString ulViewEvaluateScript(ULView view, ULString js_string, ULString* exception);
///
/// Check if can navigate backwards in history.
///
ULExport bool ulViewCanGoBack(ULView view);
///
/// Check if can navigate forwards in history.
///
ULExport bool ulViewCanGoForward(ULView view);
///
/// Navigate backwards in history.
///
ULExport void ulViewGoBack(ULView view);
///
/// Navigate forwards in history.
///
ULExport void ulViewGoForward(ULView view);
///
/// Navigate to arbitrary offset in history.
///
ULExport void ulViewGoToHistoryOffset(ULView view, int offset);
///
/// Reload current page.
///
ULExport void ulViewReload(ULView view);
///
/// Stop all page loads.
///
ULExport void ulViewStop(ULView view);
///
/// Give focus to the View.
///
/// You should call this to give visual indication that the View has input focus (changes active
/// text selection colors, for example).
///
ULExport void ulViewFocus(ULView view);
///
/// Remove focus from the View and unfocus any focused input elements.
///
/// You should call this to give visual indication that the View has lost input focus.
///
ULExport void ulViewUnfocus(ULView view);
///
/// Whether or not the View has focus.
///
ULExport bool ulViewHasFocus(ULView view);
///
/// Whether or not the View has an input element with visible keyboard focus (indicated by a
/// blinking caret).
///
/// You can use this to decide whether or not the View should consume keyboard input events (useful
/// in games with mixed UI and key handling).
///
ULExport bool ulViewHasInputFocus(ULView view);
///
/// Fire a keyboard event.
///
ULExport void ulViewFireKeyEvent(ULView view, ULKeyEvent key_event);
///
/// Fire a mouse event.
///
ULExport void ulViewFireMouseEvent(ULView view, ULMouseEvent mouse_event);
///
/// Fire a scroll event.
///
ULExport void ulViewFireScrollEvent(ULView view, ULScrollEvent scroll_event);
typedef void (*ULChangeTitleCallback)(void* user_data, ULView caller, ULString title);
///
/// Set callback for when the page title changes.
///
ULExport void ulViewSetChangeTitleCallback(ULView view, ULChangeTitleCallback callback,
void* user_data);
typedef void (*ULChangeURLCallback)(void* user_data, ULView caller, ULString url);
///
/// Set callback for when the page URL changes.
///
ULExport void ulViewSetChangeURLCallback(ULView view, ULChangeURLCallback callback,
void* user_data);
typedef void (*ULChangeTooltipCallback)(void* user_data, ULView caller, ULString tooltip);
///
/// Set callback for when the tooltip changes (usually result of a mouse hover).
///
ULExport void ulViewSetChangeTooltipCallback(ULView view, ULChangeTooltipCallback callback,
void* user_data);
typedef void (*ULChangeCursorCallback)(void* user_data, ULView caller, ULCursor cursor);
///
/// Set callback for when the mouse cursor changes.
///
ULExport void ulViewSetChangeCursorCallback(ULView view, ULChangeCursorCallback callback,
void* user_data);
typedef void (*ULAddConsoleMessageCallback)(void* user_data, ULView caller, ULMessageSource source,
ULMessageLevel level, ULString message,
unsigned int line_number, unsigned int column_number,
ULString source_id);
///
/// Set callback for when a message is added to the console (useful for JavaScript / network errors
/// and debugging).
///
ULExport void ulViewSetAddConsoleMessageCallback(ULView view, ULAddConsoleMessageCallback callback,
void* user_data);
typedef ULView (*ULCreateChildViewCallback)(void* user_data, ULView caller, ULString opener_url,
ULString target_url, bool is_popup,
ULIntRect popup_rect);
///
/// Set callback for when the page wants to create a new View.
///
/// This is usually the result of a user clicking a link with target="_blank" or by JavaScript
/// calling window.open(url).
///
/// To allow creation of these new Views, you should create a new View in this callback, resize it
/// to your container, and return it. You are responsible for displaying the returned View.
///
/// You should return NULL if you want to block the action.
///
ULExport void ulViewSetCreateChildViewCallback(ULView view, ULCreateChildViewCallback callback,
void* user_data);
typedef ULView (*ULCreateInspectorViewCallback)(void* user_data, ULView caller, bool is_local,
ULString inspected_url);
///
/// Set callback for when the page wants to create a new View to display the local inspector in.
///
/// You should create a new View in this callback, resize it to your
/// container, and return it. You are responsible for displaying the returned View.
///
ULExport void ulViewSetCreateInspectorViewCallback(ULView view, ULCreateInspectorViewCallback callback,
void* user_data);
typedef void (*ULBeginLoadingCallback)(void* user_data, ULView caller, unsigned long long frame_id,
bool is_main_frame, ULString url);
///
/// Set callback for when the page begins loading a new URL into a frame.
///
ULExport void ulViewSetBeginLoadingCallback(ULView view, ULBeginLoadingCallback callback,
void* user_data);
typedef void (*ULFinishLoadingCallback)(void* user_data, ULView caller, unsigned long long frame_id,
bool is_main_frame, ULString url);
///
/// Set callback for when the page finishes loading a URL into a frame.
///
ULExport void ulViewSetFinishLoadingCallback(ULView view, ULFinishLoadingCallback callback,
void* user_data);
typedef void (*ULFailLoadingCallback)(void* user_data, ULView caller, unsigned long long frame_id,
bool is_main_frame, ULString url, ULString description,
ULString error_domain, int error_code);
///
/// Set callback for when an error occurs while loading a URL into a frame.
///
ULExport void ulViewSetFailLoadingCallback(ULView view, ULFailLoadingCallback callback,
void* user_data);
typedef void (*ULWindowObjectReadyCallback)(void* user_data, ULView caller,
unsigned long long frame_id, bool is_main_frame,
ULString url);
///
/// Set callback for when the JavaScript window object is reset for a new page load.
///
/// This is called before any scripts are executed on the page and is the earliest time to setup any
/// initial JavaScript state or bindings.
///
/// The document is not guaranteed to be loaded/parsed at this point. If you need to make any
/// JavaScript calls that are dependent on DOM elements or scripts on the page, use DOMReady
/// instead.
///
/// The window object is lazily initialized (this will not be called on pages with no scripts).
///
ULExport void ulViewSetWindowObjectReadyCallback(ULView view, ULWindowObjectReadyCallback callback,
void* user_data);
typedef void (*ULDOMReadyCallback)(void* user_data, ULView caller, unsigned long long frame_id,
bool is_main_frame, ULString url);
///
/// Set callback for when all JavaScript has been parsed and the document is ready.
///
/// This is the best time to make any JavaScript calls that are dependent on DOM elements or scripts
/// on the page.
///
ULExport void ulViewSetDOMReadyCallback(ULView view, ULDOMReadyCallback callback, void* user_data);
typedef void (*ULUpdateHistoryCallback)(void* user_data, ULView caller);
///
/// Set callback for when the history (back/forward state) is modified.
///
ULExport void ulViewSetUpdateHistoryCallback(ULView view, ULUpdateHistoryCallback callback,
void* user_data);
///
/// Set whether or not a view should be repainted during the next call to ulRender.
///
/// @note This flag is automatically set whenever the page content changes but you can set it
/// directly in case you need to force a repaint.
///
ULExport void ulViewSetNeedsPaint(ULView view, bool needs_paint);
///
/// Whether or not a view should be painted during the next call to ulRender.
///
ULExport bool ulViewGetNeedsPaint(ULView view);
///
/// Create an Inspector View to inspect / debug this View locally.
///
/// This will only succeed if you have the inspector assets in your filesystem-- the inspector
/// will look for file:///inspector/Main.html when it first loads.
///
/// You must handle ulViewSetCreateInspectorViewCallback so that the library has a View to display
/// the inspector in. This function will call the callback only if an inspector view is not
/// currently active.
///
ULExport void ulViewCreateLocalInspectorView(ULView view);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // ULTRALIGHT_CAPI_VIEW_H