C++ BTextView::LineHeight方法代码示例

bool AuthenticationPanel::getAuthentication(const BString& text,
    const BString& previousUser, const BString& previousPass,
	bool previousRememberCredentials, bool badPassword,
	BString& user, BString&  pass, bool* rememberCredentials)
{
	// Configure panel and layout controls.
	rgb_color infoColor = ui_color(B_PANEL_TEXT_COLOR);
	BRect textBounds(0, 0, 250, 200);
	BTextView* textView = new BTextView(textBounds, "text", textBounds,
	    be_plain_font, &infoColor, B_FOLLOW_NONE, B_WILL_DRAW | B_SUPPORTS_LAYOUT);
	textView->SetViewColor(ui_color(B_PANEL_BACKGROUND_COLOR));
	textView->SetText(text.String());
	textView->MakeEditable(false);
	textView->MakeSelectable(false);

    m_usernameTextControl->SetText(previousUser.String());
	m_passwordTextControl->TextView()->HideTyping(true);
	// Ignore the previous password, if it didn't work.
	if (!badPassword)
	    m_passwordTextControl->SetText(previousPass.String());
	m_hidePasswordCheckBox->SetValue(B_CONTROL_ON);
	m_rememberCredentialsCheckBox->SetValue(previousRememberCredentials);

	// create layout
	SetLayout(new BGroupLayout(B_VERTICAL, 0.0));
	float spacing = be_control_look->DefaultItemSpacing();
	AddChild(BGroupLayoutBuilder(B_VERTICAL, 0.0)
	    .Add(BGridLayoutBuilder(0, spacing)
	        .Add(textView, 0, 0, 2)
	        .Add(m_usernameTextControl->CreateLabelLayoutItem(), 0, 1)
	        .Add(m_usernameTextControl->CreateTextViewLayoutItem(), 1, 1)
	        .Add(m_passwordTextControl->CreateLabelLayoutItem(), 0, 2)
	        .Add(m_passwordTextControl->CreateTextViewLayoutItem(), 1, 2)
	        .Add(BSpaceLayoutItem::CreateGlue(), 0, 3)
	        .Add(m_hidePasswordCheckBox, 1, 3)
	        .Add(m_rememberCredentialsCheckBox, 0, 4, 2)
	        .SetInsets(spacing, spacing, spacing, spacing)
	    )
	    .Add(new BSeparatorView(B_HORIZONTAL, B_PLAIN_BORDER))
	    .Add(BGroupLayoutBuilder(B_HORIZONTAL, spacing)
	        .AddGlue()
	        .Add(m_cancelButton)
	        .Add(m_okButton)
	        .SetInsets(spacing, spacing, spacing, spacing)
	    )
	);

	float textHeight = textView->LineHeight(0) * textView->CountLines();
	textView->SetExplicitMinSize(BSize(B_SIZE_UNSET, textHeight));

	SetDefaultButton(m_okButton);
	if (badPassword && previousUser.Length())
	    m_passwordTextControl->MakeFocus(true);
	else
	    m_usernameTextControl->MakeFocus(true);

    if (m_parentWindowFrame.IsValid())
        CenterIn(m_parentWindowFrame);
    else
        CenterOnScreen();

	// Start AuthenticationPanel window thread
	Show();

	// Let the window jitter, if the previous password was invalid
	if (badPassword)
		PostMessage(kMsgJitter);

	// Block calling thread
	// Get the originating window, if it exists, to let it redraw itself.
	BWindow* window = dynamic_cast<BWindow*>(BLooper::LooperForThread(find_thread(NULL)));
	if (window) {
		status_t err;
		for (;;) {
			do {
				err = acquire_sem_etc(m_exitSemaphore, 1, B_RELATIVE_TIMEOUT, 10000);
				// We've (probably) had our time slice taken away from us
			} while (err == B_INTERRUPTED);

			if (err != B_TIMED_OUT) {
				// Semaphore was finally released or nuked.
				break;
			}
			window->UpdateIfNeeded();
		}
	} else {
		// No window to update, so just hang out until we're done.
		while (acquire_sem(m_exitSemaphore) == B_INTERRUPTED) {
		}
	}

	// AuthenticationPanel wants to quit.
	Lock();

	user = m_usernameTextControl->Text();
	pass = m_passwordTextControl->Text();
	if (rememberCredentials)
        *rememberCredentials = m_rememberCredentialsCheckBox->Value() == B_CONTROL_ON;

    bool canceled = m_cancelled;
//.........这里部分代码省略.........

void
BTextWidget::StartEdit(BRect bounds, BPoseView *view, BPose *pose)
{
	if (!IsEditable())
		return;

	// don't allow editing of the trash directory name
	if (pose->TargetModel()->IsTrash())
		return;

	// don't allow editing of the "Disks" icon name
	if (pose->TargetModel()->IsRoot())
		return;

	BEntry entry(pose->TargetModel()->EntryRef());
	if (entry.InitCheck() == B_OK 
		&& !ConfirmChangeIfWellKnownDirectory(&entry, "rename"))
		return;

	// get bounds with full text length
	BRect rect(bounds);
	BRect textRect(bounds);
	rect.OffsetBy(-2, -1);
	rect.right += 1;

	BFont font;
	view->GetFont(&font);
	BTextView *textView = new BTextView(rect, "WidgetTextView", textRect, &font, 0,
		B_FOLLOW_ALL, B_WILL_DRAW);

	textView->SetWordWrap(false);
	DisallowMetaKeys(textView);
	fText->SetUpEditing(textView);

	textView->AddFilter(new BMessageFilter(B_KEY_DOWN, TextViewFilter));

	rect.right = rect.left + textView->LineWidth() + 3;
	// center new width, if necessary
	if (view->ViewMode() == kIconMode
		|| (view->ViewMode() == kListMode && fAlignment == B_ALIGN_CENTER)) {
		rect.OffsetBy(bounds.Width() / 2 - rect.Width() / 2, 0);
	}

	rect.bottom = rect.top + textView->LineHeight() + 1;
	textRect = rect.OffsetToCopy(2, 1);
	textRect.right -= 3;
	textRect.bottom--;
	textView->SetTextRect(textRect);

	textRect = view->Bounds();
	bool hitBorder = false;
	if (rect.left < 1)
		rect.left = 1, hitBorder = true;
	if (rect.right > textRect.right)
		rect.right = textRect.right - 2, hitBorder = true;

	textView->MoveTo(rect.LeftTop());
	textView->ResizeTo(rect.Width(), rect.Height());

	BScrollView *scrollView = new BScrollView("BorderView", textView, 0, 0, false,
		false, B_PLAIN_BORDER);
	view->AddChild(scrollView);

	// configure text view
	switch (view->ViewMode()) {
		case kIconMode:
			textView->SetAlignment(B_ALIGN_CENTER);
			break;

		case kMiniIconMode:
			textView->SetAlignment(B_ALIGN_LEFT);
			break;

		case kListMode:
			textView->SetAlignment(fAlignment);
			break;
	}
	textView->MakeResizable(true, hitBorder ? NULL : scrollView);

	view->SetActivePose(pose);		// tell view about pose
	SetActive(true);				// for widget

	textView->SelectAll();
	textView->MakeFocus();

	// make this text widget invisible while we edit it
	SetVisible(false);

	ASSERT(view->Window());	// how can I not have a Window here???

	if (view->Window())
		// force immediate redraw so TextView appears instantly
		view->Window()->UpdateIfNeeded();
}

void
BTextWidget::StartEdit(BRect bounds, BPoseView* view, BPose* pose)
{
	view->SetTextWidgetToCheck(NULL, this);
	if (!IsEditable() || IsActive())
		return;

	BEntry entry(pose->TargetModel()->EntryRef());
	if (entry.InitCheck() == B_OK
		&& !ConfirmChangeIfWellKnownDirectory(&entry,
			B_TRANSLATE_COMMENT("rename",
				"As in 'if you rename this folder...' (en) "
				"'Wird dieser Ordner umbenannt...' (de)"),
			B_TRANSLATE_COMMENT("rename",
				"As in 'to rename this folder...' (en) "
				"'Um diesen Ordner umzubenennen...' (de)"),
			B_TRANSLATE_COMMENT("Rename",
				"Button label, 'Rename' (en), 'Umbenennen' (de)")))
		return;

	// get bounds with full text length
	BRect rect(bounds);
	BRect textRect(bounds);
	rect.OffsetBy(-2, -1);
	rect.right += 1;

	BFont font;
	view->GetFont(&font);
	BTextView* textView = new BTextView(rect, "WidgetTextView", textRect,
		&font, 0, B_FOLLOW_ALL, B_WILL_DRAW);

	textView->SetWordWrap(false);
	DisallowMetaKeys(textView);
	fText->SetUpEditing(textView);

	textView->AddFilter(new BMessageFilter(B_KEY_DOWN, TextViewFilter));

	rect.right = rect.left + textView->LineWidth() + 3;
	// center new width, if necessary
	if (view->ViewMode() == kIconMode
		|| (view->ViewMode() == kListMode && fAlignment == B_ALIGN_CENTER)) {
		rect.OffsetBy(bounds.Width() / 2 - rect.Width() / 2, 0);
	}

	rect.bottom = rect.top + textView->LineHeight() + 1;
	textRect = rect.OffsetToCopy(2, 1);
	textRect.right -= 3;
	textRect.bottom--;
	textView->SetTextRect(textRect);

	BPoint origin = view->LeftTop();
	textRect = view->Bounds();

	bool hitBorder = false;
	if (rect.left <= origin.x)
		rect.left = origin.x + 1, hitBorder = true;
	if (rect.right >= textRect.right)
		rect.right = textRect.right - 1, hitBorder = true;

	textView->MoveTo(rect.LeftTop());
	textView->ResizeTo(rect.Width(), rect.Height());

	BScrollView* scrollView = new BScrollView("BorderView", textView, 0, 0,
		false, false, B_PLAIN_BORDER);
	view->AddChild(scrollView);

	// configure text view
	switch (view->ViewMode()) {
		case kIconMode:
			textView->SetAlignment(B_ALIGN_CENTER);
			break;

		case kMiniIconMode:
			textView->SetAlignment(B_ALIGN_LEFT);
			break;

		case kListMode:
			textView->SetAlignment(fAlignment);
			break;
	}
	textView->MakeResizable(true, hitBorder ? NULL : scrollView);

	view->SetActivePose(pose);
		// tell view about pose
	SetActive(true);
		// for widget

	textView->SelectAll();
	textView->MakeFocus();

	// make this text widget invisible while we edit it
	SetVisible(false);

	ASSERT(view->Window() != NULL);
		// how can I not have a Window here???

	if (view->Window()) {
		// force immediate redraw so TextView appears instantly
		view->Window()->UpdateIfNeeded();
	}
//.........这里部分代码省略.........