webview.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

        for (unsigned i = 0; i < _countof(keyPressEntries); i++)
            keyPressCommandsMap->set(keyPressEntries[i].modifiers << 16 | keyPressEntries[i].charCode, keyPressEntries[i].name);
    }

    unsigned modifiers = 0;
    if (evt->shiftKey())
        modifiers |= ShiftKey;
    if (evt->altKey())
        modifiers |= AltKey;
    if (evt->ctrlKey())
        modifiers |= CtrlKey;

    if (evt->type() == eventNames().keydownEvent) {
        int mapKey = modifiers << 16 | evt->keyCode();
        return mapKey ? keyDownCommandsMap->get(mapKey) : 0;
    }

    int mapKey = modifiers << 16 | evt->charCode();
    return mapKey ? keyPressCommandsMap->get(mapKey) : 0;
}

bool WebView::handleEditingKeyboardEvent(KeyboardEvent* evt)
{
    Node* node = evt->target()->toNode();
    ASSERT(node);
    Frame* frame = node->document()->frame();
    ASSERT(frame);

    const PlatformKeyboardEvent* keyEvent = evt->keyEvent();
    if (!keyEvent || keyEvent->isSystemKey())  // do not treat this as text input if it's a system key event
        return false;

    Editor::Command command = frame->editor()->command(interpretKeyEvent(evt));

    if (keyEvent->type() == PlatformKeyboardEvent::RawKeyDown) {
        // WebKit doesn't have enough information about mode to decide how commands that just insert text if executed via Editor should be treated,
        // so we leave it upon WebCore to either handle them immediately (e.g. Tab that changes focus) or let a keypress event be generated
        // (e.g. Tab that inserts a Tab character, or Enter).
        return !command.isTextInsertion() && command.execute(evt);
    }

     if (command.execute(evt))
        return true;

    // Don't insert null or control characters as they can result in unexpected behaviour
    if (evt->charCode() < ' ')
        return false;

    return frame->editor()->insertText(evt->keyEvent()->text(), evt);
}

bool WebView::keyDown(WPARAM virtualKeyCode, LPARAM keyData, bool systemKeyDown)
{
    Frame* frame = m_page->focusController()->focusedOrMainFrame();
    if (virtualKeyCode == VK_CAPITAL)
        frame->eventHandler()->capsLockStateMayHaveChanged();

    PlatformKeyboardEvent keyEvent(m_viewWindow, virtualKeyCode, keyData, PlatformKeyboardEvent::RawKeyDown, systemKeyDown);
    bool handled = frame->eventHandler()->keyEvent(keyEvent);

    // These events cannot be canceled, and we have no default handling for them.
    // FIXME: match IE list more closely, see <http://msdn2.microsoft.com/en-us/library/ms536938.aspx>.
    if (systemKeyDown && virtualKeyCode != VK_RETURN)
        return false;

    if (handled) {
        // FIXME: remove WM_UNICHAR, too
        MSG msg;
        // WM_SYSCHAR events should not be removed, because access keys are implemented in WebCore in WM_SYSCHAR handler.
        if (!systemKeyDown)
            ::PeekMessage(&msg, m_viewWindow, WM_CHAR, WM_CHAR, PM_REMOVE);
        return true;
    }

    // We need to handle back/forward using either Backspace(+Shift) or Ctrl+Left/Right Arrow keys.
    if ((virtualKeyCode == VK_BACK && keyEvent.shiftKey()) || (virtualKeyCode == VK_RIGHT && keyEvent.ctrlKey()))
        m_page->goForward();
    else if (virtualKeyCode == VK_BACK || (virtualKeyCode == VK_LEFT && keyEvent.ctrlKey()))
        m_page->goBack();
    
    // Need to scroll the page if the arrow keys, pgup/dn, or home/end are hit.
    ScrollDirection direction;
    ScrollGranularity granularity;
    switch (virtualKeyCode) {
        case VK_LEFT:
            granularity = ScrollByLine;
            direction = ScrollLeft;
            break;
        case VK_RIGHT:
            granularity = ScrollByLine;
            direction = ScrollRight;
            break;
        case VK_UP:
            granularity = ScrollByLine;
            direction = ScrollUp;
            break;
        case VK_DOWN:
            granularity = ScrollByLine;
            direction = ScrollDown;
            break;
        case VK_HOME:
            granularity = ScrollByDocument;
            direction = ScrollUp;
            break;
        case VK_END:
            granularity = ScrollByDocument;
            direction = ScrollDown;
            break;
        case VK_PRIOR:
            granularity = ScrollByPage;
            direction = ScrollUp;
            break;
        case VK_NEXT:
            granularity = ScrollByPage;
            direction = ScrollDown;
            break;
        default:
            return false;
    }

    if (!frame->eventHandler()->scrollOverflow(direction, granularity)) {
        handled = frame->view()->scroll(direction, granularity);
        Frame* parent = frame->tree()->parent();
        while(!handled && parent) {
            handled = parent->view()->scroll(direction, granularity);
            parent = parent->tree()->parent();
        }
    }
    return handled;
}

bool WebView::keyPress(WPARAM charCode, LPARAM keyData, bool systemKeyDown)
{
    Frame* frame = m_page->focusController()->focusedOrMainFrame();

    PlatformKeyboardEvent keyEvent(m_viewWindow, charCode, keyData, PlatformKeyboardEvent::Char, systemKeyDown);
    // IE does not dispatch keypress event for WM_SYSCHAR.
    if (systemKeyDown)
        return frame->eventHandler()->handleAccessKey(keyEvent);
    return frame->eventHandler()->keyEvent(keyEvent);
}

bool WebView::inResizer(LPARAM lParam)
{
    if (!m_uiDelegatePrivate)
        return false;

    RECT r;
    if (FAILED(m_uiDelegatePrivate->webViewResizerRect(this, &r)))
        return false;

    POINT pt;
    pt.x = LOWORD(lParam);
    pt.y = HIWORD(lParam);
    return !!PtInRect(&r, pt);
}

static bool registerWebViewWindowClass()
{
    static bool haveRegisteredWindowClass = false;
    if (haveRegisteredWindowClass)
        return true;

    haveRegisteredWindowClass = true;

    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_DBLCLKS;
    wcex.lpfnWndProc    = WebViewWndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 4; // 4 bytes for the IWebView pointer
    wcex.hInstance      = gInstance;
    wcex.hIcon          = 0;
    wcex.hCursor        = ::LoadCursor(0, IDC_ARROW);
    wcex.hbrBackground  = 0;
    wcex.lpszMenuName   = 0;
    wcex.lpszClassName  = kWebViewWindowClassName;
    wcex.hIconSm        = 0;

    return !!RegisterClassEx(&wcex);
}

namespace WebCore {
    extern HCURSOR lastSetCursor;
}

static HWND findTopLevelParent(HWND window)
{
    if (!window)
        return 0;

    HWND current = window;
    for (HWND parent = GetParent(current); current; current = parent, parent = GetParent(parent))
        if (!parent || !(GetWindowLongPtr(current, GWL_STYLE) & (WS_POPUP | WS_CHILD)))
            return current;
    ASSERT_NOT_REACHED();
    return 0;
}

static LRESULT CALLBACK WebViewWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    LRESULT lResult = 0;
    LONG_PTR longPtr = GetWindowLongPtr(hWnd, 0);
    WebView* webView = reinterpret_cast<WebView*>(longPtr);
    WebFrame* mainFrameImpl = webView ? webView->topLevelFrame() : 0;
    if (!mainFrameImpl || webView->isBeingDestroyed())
        return DefWindowProc(hWnd, message, wParam, lParam);

    // hold a ref, since the WebView could go away in an event handler.
    COMPtr<WebView> protector(webView);
    ASSERT(webView);

    // Windows Media Player has a modal message loop that will deliver messages
    // to us at inappropriate times and we will crash if we handle them when
    // they are delivered. We repost paint messages so that we eventually get
    // a chance to paint once the modal loop has exited, but other messages
    // aren't safe to repost, so we just drop them.
    if (PluginView::isCallingPlugin()) {
        if (message == WM_PAINT)
            PostMessage(hWnd, message, wParam, lParam);
        return 0;
    }

    bool handled = true;

    switch (message) {
        case WM_PAINT: {
            webView->paint(0, 0);
            break;
        }
        case WM_PRINTCLIENT:
            webView->paint((HDC)wParam, lParam);
            break;
        case WM_DESTROY:
            webView->close();
            webView->setIsBeingDestroyed();
            webView->revokeDragDrop();
            break;
        case WM_MOUSEMOVE:
        case WM_LBUTTONDOWN:
        case WM_MBUTTONDOWN:
        case WM_RBUTTONDOWN:
        case WM_LBUTTONDBLCLK:
        case WM_MBUTTONDBLCLK:
        case WM_RBUTTONDBLCLK:
        case WM_LBUTTONUP:
        case WM_MBUTTONUP:
        case WM_RBUTTONUP:
        case WM_MOUSELEAVE:
            if (Frame* coreFrame = core(mainFrameImpl))
                if (coreFrame->view()->didFirstLayout())
                    handled = webView->handleMouseEvent(message, wParam, lParam);
            break;
        case WM_MOUSEWHEEL:
        case WM_VISTA_MOUSEHWHEEL:
            if (Frame* coreFrame = core(mainFrameImpl))
                if (coreFrame->view()->didFirstLayout())
                    handled = webView->mouseWheel(wParam, lParam, (wParam & MK_SHIFT) || message == WM_VISTA_MOUSEHWHEEL);
            break;
        case WM_SYSKEYDOWN:
            handled = webView->keyDown(wParam, lParam, true);
            break;
        case WM_KEYDOWN:
            handled = webView->keyDown(wParam, lParam);
            break;
        case WM_SYSKEYUP:
            handled = webView->keyUp(wParam, lParam, true);
            break;
        case WM_KEYUP:
            handled = webView->keyUp(wParam, lParam);
            break;
        case WM_SYSCHAR:
            handled = webView->keyPress(wParam, lParam, true);
            break;
        case WM_CHAR:
            handled = webView->keyPress(wParam, lParam);
            break;
        // FIXME: We need to check WM_UNICHAR to support supplementary characters (that don't fit in 16 bits).
        case WM_SIZE:
            if (webView->isBeingDestroyed())
                // If someone has sent us this message while we're being destroyed, we should bail out so we don't crash.
                break;

            if (lParam != 0) {
                webView->deleteBackingStore();
                if (Frame* coreFrame = core(mainFrameImpl))
                    coreFrame->view()->resize(LOWORD(lParam), HIWORD(lParam));
            }
            break;
        case WM_SHOWWINDOW:
            lResult = DefWindowProc(hWnd, message, wParam, lParam);
            if (wParam == 0)
                // The window is being hidden (e.g., because we switched tabs.
                // Null out our backing store.
                webView->deleteBackingStore();
            break;
        case WM_SETFOCUS: {
            COMPtr<IWebUIDelegate> uiDelegate;
            COMPtr<IWebUIDelegatePrivate> uiDelegatePrivate;
            if (SUCCEEDED(webView->uiDelegate(&uiDelegate)) && uiDelegate &&
                SUCCEEDED(uiDelegate->QueryInterface(IID_IWebUIDelegatePrivate, (void**) &uiDelegatePrivate)) && uiDelegatePrivate)
                uiDelegatePrivate->webViewReceivedFocus(webView);

            FocusController* focusController = webView->page()->focusController();
            if (Frame* frame = focusController->focusedFrame()) {
                // Send focus events unless the previously focused window is a
                // child of ours (for example a plugin).
                if (!IsChild(hWnd, reinterpret_cast<HWND>(wParam)))
                    frame->selection()->setFocused(true);
            } else
                focusController->setFocusedFrame(webView->page()->mainFrame());
            break;
        }
        case WM_KILLFOCUS: {
            COMPtr<IWebUIDelegate> uiDelegate;
            COMPtr<IWebUIDelegatePrivate> uiDelegatePrivate;
            HWND newFocusWnd = reinterpret_cast<HWND>(wParam);
            if (SUCCEEDED(webView->uiDelegate(&uiDelegate)) && uiDelegate &&
                SUCCEEDED(uiDelegate->QueryInterface(IID_IWebUIDelegatePrivate, (void**) &uiDelegatePrivate)) && uiDelegatePrivate)
                uiDelegatePrivate->webViewLostFocus(webView, (OLE_HANDLE)(ULONG64)newFocusWnd);

            FocusController* focusController = webView->page()->focusController();
            Frame* frame = focusController->focusedOrMainFrame();
            webView->resetIME(frame);
            // Send blur events unless we're losing focus to a child of ours.
            if (!IsChild(hWnd, newFocusWnd))
                frame->selection()->setFocused(false);
            break;
        }
        case WM_WINDOWPOSCHANGED:
            if (reinterpret_cast<WINDOWPOS*>(lParam)->flags & SWP_SHOWWINDOW)
                webView->updateActiveStateSoon();
            handled = false;
            break;
        case WM_CUT:
            webView->cut(0);
            break;
        case WM_COPY:
            webView->copy(0);
            break;
        case WM_PASTE:
            webView->paste(0);
            break;
        case WM_CLEAR:
            webView->delete_(0);
            break;
        case WM_COMMAND:
            if (HIWORD(wParam))
                handled = webView->execCommand(wParam, lParam);
            else // If the high word of wParam is 0, the message is from a menu
                webView->performContextMenuAction(wParam, lParam, false);
            break;
        case WM_MENUCOMMAND:
            webView->performContextMenuAction(wParam, lParam, true);
            break;
        case WM_CONTEXTMENU:
            handled = webView->handleContextMenuEvent(wParam, lParam)