kits/tracker/TextWidget.cpp

/*
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Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
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of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

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and shall be included in all copies or substantial portions of the Software.

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Tracker(TM), Be(R), BeOS(R), and BeIA(TM) are trademarks or registered trademarks
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All rights reserved.
*/


#include "TextWidget.h"

#include <string.h>
#include <stdlib.h>

#include <Alert.h>
#include <Catalog.h>
#include <Clipboard.h>
#include <Debug.h>
#include <Directory.h>
#include <MessageFilter.h>
#include <ScrollView.h>
#include <TextView.h>
#include <Volume.h>
#include <Window.h>

#include "Attributes.h"
#include "ContainerWindow.h"
#include "Commands.h"
#include "FSUtils.h"
#include "PoseView.h"
#include "Utilities.h"


#undef B_TRANSLATION_CONTEXT
#define B_TRANSLATION_CONTEXT "TextWidget"


const float kWidthMargin = 20;


//	#pragma mark - BTextWidget


BTextWidget::BTextWidget(Model* model, BColumn* column, BPoseView* view)
	:
	fText(WidgetAttributeText::NewWidgetText(model, column, view)),
	fAttrHash(column->AttrHash()),
	fAlignment(column->Alignment()),
	fEditable(column->Editable()),
	fVisible(true),
	fActive(false),
	fSymLink(model->IsSymLink()),
	fMaxWidth(0),
	fLastClickedTime(0)
{
}


BTextWidget::~BTextWidget()
{
	if (fLastClickedTime != 0)
		fParams.poseView->SetTextWidgetToCheck(NULL, this);

	delete fText;
}


int
BTextWidget::Compare(const BTextWidget& with, BPoseView* view) const
{
	return fText->Compare(*with.fText, view);
}


const char*
BTextWidget::Text(const BPoseView* view) const
{
	StringAttributeText* textAttribute
		= dynamic_cast<StringAttributeText*>(fText);
	if (textAttribute == NULL)
		return NULL;

	return textAttribute->ValueAsText(view);
}


float
BTextWidget::TextWidth(const BPoseView* pose) const
{
	return fText->Width(pose);
}


float
BTextWidget::PreferredWidth(const BPoseView* pose) const
{
	return fText->PreferredWidth(pose);
}


BRect
BTextWidget::ColumnRect(BPoint poseLoc, const BColumn* column,
	const BPoseView* view)
{
	if (view->ViewMode() != kListMode) {
		// ColumnRect only makes sense in list view, return
		// CalcRect otherwise
		return CalcRect(poseLoc, column, view);
	}
	BRect result;
	result.left = column->Offset() + poseLoc.x;
	result.right = result.left + column->Width();
	result.bottom = poseLoc.y
		+ roundf((view->ListElemHeight() + ActualFontHeight(view)) / 2);
	result.top = result.bottom - floorf(ActualFontHeight(view));
	return result;
}


BRect
BTextWidget::CalcRectCommon(BPoint poseLoc, const BColumn* column,
	const BPoseView* view, float textWidth)
{
	textWidth -= 1;
	BRect result;
	float viewWidth = textWidth;

	if (view->ViewMode() == kListMode) {
		viewWidth = std::min(column->Width(), textWidth);

		poseLoc.x += column->Offset();

		switch (fAlignment) {
			case B_ALIGN_LEFT:
				result.left = poseLoc.x;
				result.right = result.left + viewWidth;
				break;

			case B_ALIGN_CENTER:
				result.left = poseLoc.x
					+ roundf((column->Width() - viewWidth) / 2);
				if (result.left < 0)
					result.left = 0;

				result.right = result.left + viewWidth;
				break;

			case B_ALIGN_RIGHT:
				result.right = poseLoc.x + column->Width();
				result.left = result.right - viewWidth;
				if (result.left < 0)
					result.left = 0;
				break;

			default:
				TRESPASS();
				break;
		}

		result.bottom = poseLoc.y
			+ roundf((view->ListElemHeight() + ActualFontHeight(view)) / 2);
	} else {
		viewWidth = std::min(view->StringWidth("M") * 30, textWidth);
		if (view->ViewMode() == kIconMode) {
			// icon mode
			result.left = poseLoc.x
				+ roundf((view->IconSizeInt() - viewWidth) / 2);
		} else {
			// mini icon mode
			result.left = poseLoc.x + view->IconSizeInt() + kMiniIconSeparator;
		}
		result.bottom = poseLoc.y + view->IconPoseHeight();

		result.right = result.left + viewWidth;
	}

	result.top = result.bottom - floorf(ActualFontHeight(view));

	return result;
}


BRect
BTextWidget::CalcRect(BPoint poseLoc, const BColumn* column,
	const BPoseView* view)
{
	return CalcRectCommon(poseLoc, column, view, fText->Width(view));
}


BRect
BTextWidget::CalcOldRect(BPoint poseLoc, const BColumn* column,
	const BPoseView* view)
{
	return CalcRectCommon(poseLoc, column, view, fText->CurrentWidth());
}


BRect
BTextWidget::CalcClickRect(BPoint poseLoc, const BColumn* column,
	const BPoseView* view)
{
	BRect result = CalcRect(poseLoc, column, view);
	if (result.Width() < kWidthMargin) {
		// if resulting rect too narrow, make it a bit wider
		// for comfortable clicking
		if (column != NULL && column->Width() < kWidthMargin)
			result.right = result.left + column->Width();
		else
			result.right = result.left + kWidthMargin;
	}

	return result;
}


void
BTextWidget::CheckExpiration()
{
	if (IsEditable() && fParams.pose->IsSelected() && fLastClickedTime) {
		bigtime_t doubleClickSpeed;
		get_click_speed(&doubleClickSpeed);

		bigtime_t delta = system_time() - fLastClickedTime;

		if (delta > doubleClickSpeed) {
			// at least 'doubleClickSpeed' microseconds ellapsed and no click
			// was registered since.
			fLastClickedTime = 0;
			StartEdit(fParams.bounds, fParams.poseView, fParams.pose);
		}
	} else {
		fLastClickedTime = 0;
		fParams.poseView->SetTextWidgetToCheck(NULL);
	}
}


void
BTextWidget::CancelWait()
{
	fLastClickedTime = 0;
	fParams.poseView->SetTextWidgetToCheck(NULL);
}


void
BTextWidget::MouseUp(BRect bounds, BPoseView* view, BPose* pose, BPoint)
{
	// Register the time of that click.  The PoseView, through its Pulse()
	// will allow us to StartEdit() if no other click have been registered since
	// then.

	// TODO: re-enable modifiers, one should be enough
	view->SetTextWidgetToCheck(NULL);
	if (IsEditable() && pose->IsSelected()) {
		bigtime_t doubleClickSpeed;
		get_click_speed(&doubleClickSpeed);

		if (fLastClickedTime == 0) {
			fLastClickedTime = system_time();
			if (fLastClickedTime - doubleClickSpeed < pose->SelectionTime())
				fLastClickedTime = 0;
		} else
			fLastClickedTime = 0;

		if (fLastClickedTime == 0)
			return;

		view->SetTextWidgetToCheck(this);

		fParams.pose = pose;
		fParams.bounds = bounds;
		fParams.poseView = view;
	} else
		fLastClickedTime = 0;
}


static filter_result
TextViewKeyDownFilter(BMessage* message, BHandler**, BMessageFilter* filter)
{
	uchar key;
	if (message->FindInt8("byte", (int8*)&key) != B_OK)
		return B_DISPATCH_MESSAGE;

	ThrowOnAssert(filter != NULL);

	BContainerWindow* window = dynamic_cast<BContainerWindow*>(
		filter->Looper());
	ThrowOnAssert(window != NULL);

	BPoseView* view = window->PoseView();
	ThrowOnAssert(view != NULL);

	if (key == B_RETURN || key == B_ESCAPE) {
		view->CommitActivePose(key == B_RETURN);
		return B_SKIP_MESSAGE;
	}

	if (key == B_TAB) {
		if (view->ActivePose()) {
			if (message->FindInt32("modifiers") & B_SHIFT_KEY)
				view->ActivePose()->EditPreviousWidget(view);
			else
				view->ActivePose()->EditNextWidget(view);
		}

		return B_SKIP_MESSAGE;
	}

	// the BTextView doesn't respect window borders when resizing itself;
	// we try to work-around this "bug" here.

	// find the text editing view
	BView* scrollView = view->FindView("BorderView");
	if (scrollView != NULL) {
		BTextView* textView = dynamic_cast<BTextView*>(
			scrollView->FindView("WidgetTextView"));
		if (textView != NULL) {
			ASSERT(view->ActiveTextWidget() != NULL);
			float maxWidth = view->ActiveTextWidget()->MaxWidth();
			bool tooWide = textView->TextRect().Width() > maxWidth;
			textView->MakeResizable(!tooWide, tooWide ? NULL : scrollView);
		}
	}

	return B_DISPATCH_MESSAGE;
}


static filter_result
TextViewPasteFilter(BMessage* message, BHandler**, BMessageFilter* filter)
{
	ThrowOnAssert(filter != NULL);

	BContainerWindow* window = dynamic_cast<BContainerWindow*>(
		filter->Looper());
	ThrowOnAssert(window != NULL);

	BPoseView* view = window->PoseView();
	ThrowOnAssert(view != NULL);

	// the BTextView doesn't respect window borders when resizing itself;
	// we try to work-around this "bug" here.

	// find the text editing view
	BView* scrollView = view->FindView("BorderView");
	if (scrollView != NULL) {
		BTextView* textView = dynamic_cast<BTextView*>(
			scrollView->FindView("WidgetTextView"));
		if (textView != NULL) {
			float textWidth = textView->TextRect().Width();

			// subtract out selected text region width
			int32 start, finish;
			textView->GetSelection(&start, &finish);
			if (start != finish) {
				BRegion selectedRegion;
				textView->GetTextRegion(start, finish, &selectedRegion);
				textWidth -= selectedRegion.Frame().Width();
			}

			// add pasted text width
			if (be_clipboard->Lock()) {
				BMessage* clip = be_clipboard->Data();
				if (clip != NULL) {
					const char* text = NULL;
					ssize_t length = 0;

					if (clip->FindData("text/plain", B_MIME_TYPE,
							(const void**)&text, &length) == B_OK) {
						textWidth += textView->StringWidth(text);
					}
				}

				be_clipboard->Unlock();
			}

			// check if pasted text is too wide
			ASSERT(view->ActiveTextWidget() != NULL);
			float maxWidth = view->ActiveTextWidget()->MaxWidth();
			bool tooWide = textWidth > maxWidth;

			if (tooWide) {
				// resize text view to max width

				// move scroll view if not left aligned
				float oldWidth = textView->Bounds().Width();
				float newWidth = maxWidth;
				float right = oldWidth - newWidth;

				if (textView->Alignment() == B_ALIGN_CENTER)
					scrollView->MoveBy(roundf(right / 2), 0);
				else if (textView->Alignment() == B_ALIGN_RIGHT)
					scrollView->MoveBy(right, 0);

				// resize scroll view
				float grow = newWidth - oldWidth;
				scrollView->ResizeBy(grow, 0);
			}

			textView->MakeResizable(!tooWide, tooWide ? NULL : scrollView);
		}
	}

	return B_DISPATCH_MESSAGE;
}


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

	view->SetActiveTextWidget(this);

	BRect rect(bounds);
	rect.OffsetBy(view->ViewMode() == kListMode ? -2 : 0, -2);
	BTextView* textView = new BTextView(rect, "WidgetTextView", rect,
		be_plain_font, 0, B_FOLLOW_ALL, B_WILL_DRAW);

	textView->SetWordWrap(false);
	textView->SetInsets(2, 2, 2, 2);
	DisallowMetaKeys(textView);
	fText->SetupEditing(textView);

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

	if (view->SelectedVolumeIsReadOnly()) {
		textView->MakeEditable(false);
		textView->MakeSelectable(true);
		// tint text view background color to indicate not editable
		textView->SetViewColor(tint_color(textView->ViewColor(),
			ReadOnlyTint(textView->ViewColor())));
	} else
		textView->AddFilter(new BMessageFilter(B_PASTE, TextViewPasteFilter));

	// get full text length
	rect.right = rect.left + textView->LineWidth();
	rect.bottom = rect.top + textView->LineHeight() - 1 + 4;

	if (view->ViewMode() == kListMode) {
		// limit max width to column width in list mode
		BColumn* column = view->ColumnFor(fAttrHash);
		ASSERT(column != NULL);
		fMaxWidth = column->Width();
	} else {
		// limit max width to 30em in icon and mini icon mode
		fMaxWidth = textView->StringWidth("M") * 30;

		if (textView->LineWidth() > fMaxWidth
			|| view->ViewMode() == kMiniIconMode) {
			// compensate for text going over right inset
			rect.OffsetBy(-2, 0);
		}
	}

	// resize textView
	textView->MoveTo(rect.LeftTop());
	textView->ResizeTo(std::min(fMaxWidth, rect.Width()), rect.Height());
	textView->SetTextRect(rect);

	// set alignment before adding textView so it doesn't redraw
	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;
	}

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

	bool tooWide = textView->TextRect().Width() > fMaxWidth;
	textView->MakeResizable(!tooWide, tooWide ? NULL : scrollView);

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

	textView->SelectAll();
	textView->ScrollToSelection();
		// scroll to beginning so that text is visible
	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();
	}
}


void
BTextWidget::StopEdit(bool saveChanges, BPoint poseLoc, BPoseView* view,
	BPose* pose, int32 poseIndex)
{
	view->SetActiveTextWidget(NULL);

	// find the text editing view
	BView* scrollView = view->FindView("BorderView");
	ASSERT(scrollView != NULL);
	if (scrollView == NULL)
		return;

	BTextView* textView = dynamic_cast<BTextView*>(
		scrollView->FindView("WidgetTextView"));
	ASSERT(textView != NULL);
	if (textView == NULL)
		return;

	BColumn* column = view->ColumnFor(fAttrHash);
	ASSERT(column != NULL);
	if (column == NULL)
		return;

	if (saveChanges && fText->CommitEditedText(textView)) {
		// we have an actual change, re-sort
		view->CheckPoseSortOrder(pose, poseIndex);
	}

	// make text widget visible again
	SetVisible(true);
	view->Invalidate(ColumnRect(poseLoc, column, view));

	// force immediate redraw so TEView disappears
	scrollView->RemoveSelf();
	delete scrollView;

	ASSERT(view->Window() != NULL);
	view->Window()->UpdateIfNeeded();
	view->MakeFocus();

	SetActive(false);
}


void
BTextWidget::CheckAndUpdate(BPoint loc, const BColumn* column,
	BPoseView* view, bool visible)
{
	BRect oldRect;
	if (view->ViewMode() != kListMode)
		oldRect = CalcOldRect(loc, column, view);

	if (fText->CheckAttributeChanged() && fText->CheckViewChanged(view)
		&& visible) {
		BRect invalRect(ColumnRect(loc, column, view));
		if (view->ViewMode() != kListMode)
			invalRect = invalRect | oldRect;
		view->Invalidate(invalRect);
	}
}


void
BTextWidget::SelectAll(BPoseView* view)
{
	BTextView* text = dynamic_cast<BTextView*>(
		view->FindView("WidgetTextView"));
	if (text != NULL)
		text->SelectAll();
}


void
BTextWidget::Draw(BRect eraseRect, BRect textRect, float, BPoseView* view,
	BView* drawView, bool selected, uint32 clipboardMode, BPoint offset,
	bool direct)
{
	textRect.OffsetBy(offset);

	// We are only concerned with setting the correct text color.

	// For active views the selection is drawn as inverse text
	// (background color for the text, solid black for the background).
	// For inactive windows the text is drawn normally, then the
	// selection rect is alpha-blended on top. This all happens in
	// BPose::Draw before and after calling this function.

	if (direct) {
		// draw selection box if selected
		if (selected) {
			drawView->SetDrawingMode(B_OP_COPY);
			drawView->FillRect(textRect, B_SOLID_LOW);
		} else
			drawView->SetDrawingMode(B_OP_OVER);

		// set high color
		rgb_color highColor;
		highColor = view->TextColor(selected && view->Window()->IsActive());

		if (clipboardMode == kMoveSelectionTo && !selected) {
			drawView->SetDrawingMode(B_OP_ALPHA);
			drawView->SetBlendingMode(B_PIXEL_ALPHA, B_ALPHA_OVERLAY);
			highColor.alpha = 64;
		}
		drawView->SetHighColor(highColor);
	} else if (selected && view->Window()->IsActive())
		drawView->SetHighColor(view->BackColor(true)); // inverse
	else if (!selected)
		drawView->SetHighColor(view->TextColor());

	BPoint location;
	location.y = textRect.bottom - view->FontInfo().descent + 1;
	location.x = textRect.left;

	const char* fittingText = fText->FittingText(view);

	// TODO: Comparing view and drawView here to avoid rendering
	// the text outline when producing a drag bitmap. The check is
	// not fully correct, since an offscreen view is also used in some
	// other rare cases (something to do with columns). But for now, this
	// fixes the broken drag bitmaps when dragging icons from the Desktop.
	if (direct && !selected && view->WidgetTextOutline()) {
		// draw a halo around the text by using the "false bold"
		// feature for text rendering. Either black or white is used for
		// the glow (whatever acts as contrast) with a some alpha value,
		drawView->SetDrawingMode(B_OP_ALPHA);
		drawView->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_OVERLAY);

		BFont font;
		drawView->GetFont(&font);

		rgb_color textColor = view->TextColor();
		if (textColor.IsDark()) {
			// dark text on light outline
			rgb_color glowColor = ui_color(B_SHINE_COLOR);

			font.SetFalseBoldWidth(2.0);
			drawView->SetFont(&font, B_FONT_FALSE_BOLD_WIDTH);
			glowColor.alpha = 30;
			drawView->SetHighColor(glowColor);

			drawView->DrawString(fittingText, location);

			font.SetFalseBoldWidth(1.0);
			drawView->SetFont(&font, B_FONT_FALSE_BOLD_WIDTH);
			glowColor.alpha = 65;
			drawView->SetHighColor(glowColor);

			drawView->DrawString(fittingText, location);

			font.SetFalseBoldWidth(0.0);
			drawView->SetFont(&font, B_FONT_FALSE_BOLD_WIDTH);
		} else {
			// light text on dark outline
			rgb_color outlineColor = kBlack;

			font.SetFalseBoldWidth(1.0);
			drawView->SetFont(&font, B_FONT_FALSE_BOLD_WIDTH);
			outlineColor.alpha = 30;
			drawView->SetHighColor(outlineColor);

			drawView->DrawString(fittingText, location);

			font.SetFalseBoldWidth(0.0);
			drawView->SetFont(&font, B_FONT_FALSE_BOLD_WIDTH);

			outlineColor.alpha = 200;
			drawView->SetHighColor(outlineColor);

			drawView->DrawString(fittingText, location + BPoint(1, 1));
		}

		drawView->SetDrawingMode(B_OP_OVER);
		drawView->SetHighColor(textColor);
	}

	drawView->DrawString(fittingText, location);

	if (fSymLink && (fAttrHash == view->FirstColumn()->AttrHash())) {
		// TODO:
		// this should be exported to the WidgetAttribute class, probably
		// by having a per widget kind style
		if (direct) {
			rgb_color underlineColor = drawView->HighColor();
			underlineColor.alpha = 180;
			drawView->SetHighColor(underlineColor);
			drawView->SetDrawingMode(B_OP_ALPHA);
			drawView->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_OVERLAY);
		}

		textRect.right = textRect.left + fText->Width(view);
			// only underline text part
		drawView->StrokeLine(textRect.LeftBottom(), textRect.RightBottom(),
			B_MIXED_COLORS);
	}
}