Add a default right click context menu to BTextView.

This fixes #7022 and is mostly based on the patch attached to that ticket, with
these changes:
- The patch was adding this to the private _TextInput_ class, not BTextView.
- The patch had a Clear menu item too. I removed that due to the different
semantics between Clear in a BTextView and in a TextInput. The former just
clears the selection where the latter clears the whole view.

We could later add a virtual callback for adding menu items to this context
menu which could be used to add Clear with the two semantics in each class
(this is mainly needed for the enabling logic...each class could handle a clear
message in its own way.) This callback could also obviously be used for other
things, like a spell-check menu or whatever an application would want to add.
Since BTextView has 10 free virtual slots it seems reasonable to add.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40305 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/interface/TextView.cpp

@@ -34,9 +34,11 @@
 #include <Debug.h>
 #include <Entry.h>
 #include <Input.h>
+#include <LayoutBuilder.h>
 #include <LayoutUtils.h>
 #include <MessageRunner.h>
 #include <Path.h>
+#include <PopUpMenu.h>
 #include <PropertyInfo.h>
 #include <Region.h>
 #include <ScrollBar.h>
@@ -52,8 +54,21 @@
 #include "UndoBuffer.h"
 #include "WidthBuffer.h"
 
+#include <Catalog.h>
+#include <LocaleBackend.h>
+
 
 using namespace std;
+using BPrivate::gLocaleBackend;
+using BPrivate::LocaleBackend;
+
+
+#undef B_TRANSLATE_CONTEXT
+#define B_TRANSLATE_CONTEXT "TextView"
+
+
+#define TRANSLATE(str) gLocaleBackend->GetString(B_TRANSLATE_MARK(str), \
+		"TextView")
 
 #undef TRACE
 #undef CALLED
@@ -558,19 +573,24 @@ BTextView::MouseDown(BPoint where)
 
 	_StopMouseTracking();
 
+	int32 modifiers = 0;
+	uint32 buttons;
+	BMessage *currentMessage = Window()->CurrentMessage();
+	if (currentMessage != NULL) {
+		currentMessage->FindInt32("modifiers", &modifiers);
+		currentMessage->FindInt32("buttons", (int32 *)&buttons);
+	}
+
+	if (buttons == B_SECONDARY_MOUSE_BUTTON) {
+		_ShowContextMenu(where);
+		return;
+	}
+
 	BMessenger messenger(this);
 	fTrackingMouse = new (nothrow) TextTrackState(messenger);
 	if (fTrackingMouse == NULL)
 		return;
 
-	int32 modifiers = 0;
-	//uint32 buttons;
-	BMessage *currentMessage = Window()->CurrentMessage();
-	if (currentMessage != NULL) {
-		currentMessage->FindInt32("modifiers", &modifiers);
-		//currentMessage->FindInt32("buttons", (int32 *)&buttons);
-	}
-
 	fTrackingMouse->clickOffset = OffsetAt(where);
 	fTrackingMouse->shiftDown = modifiers & B_SHIFT_KEY;
 	fTrackingMouse->where = where;
@@ -3238,6 +3258,11 @@ BTextView::_InitObject(BRect textRect, const BFont *initialFont,
 	fLastClickOffset = -1;
 
 	SetDoesUndo(true);
+
+	// We need to translate some strings, and in order to do so, we need
+	// to use the LocaleBackend to reach liblocale.so
+	if (gLocaleBackend == NULL)
+		LocaleBackend::LoadBackend();
 }
 
 
@@ -5539,6 +5564,44 @@ BTextView::_NullStyleHeight() const
 }
 
 
+void
+BTextView::_ShowContextMenu(BPoint where)
+{
+	bool isRedo;
+	undo_state state = UndoState(&isRedo);
+	bool isUndo = state != B_UNDO_UNAVAILABLE && !isRedo;
+
+	int32 start;
+	int32 finish;
+	GetSelection(&start, &finish);
+	
+	bool canEdit = IsEditable();
+	int32 length = TextLength();
+
+	BPopUpMenu *menu = new BPopUpMenu(B_EMPTY_STRING, false, false);
+
+	BLayoutBuilder::Menu<>(menu)
+		.AddItem(TRANSLATE("Undo"), B_UNDO/*, 'Z'*/)
+			.SetEnabled(canEdit && isUndo)
+		.AddItem(TRANSLATE("Redo"), B_UNDO/*, 'Z', B_SHIFT_KEY*/)
+			.SetEnabled(canEdit && isRedo)
+		.AddSeparator()
+		.AddItem(TRANSLATE("Cut"), B_CUT, 'X')
+			.SetEnabled(canEdit && start != finish)
+		.AddItem(TRANSLATE("Copy"), B_COPY, 'C')
+			.SetEnabled(start != finish)
+		.AddItem(TRANSLATE("Paste"), B_PASTE, 'V')
+			.SetEnabled(canEdit && be_clipboard->SystemCount() > 0)
+		.AddSeparator()
+		.AddItem(TRANSLATE("Select All"), B_SELECT_ALL, 'A')
+			.SetEnabled(!(start == 0 && finish == length))
+	;
+
+	menu->SetTargetForItems(this);
+	ConvertToScreen(&where);
+	menu->Go(where, true, true,	true);
+}
+
 // #pragma mark - BTextView::TextTrackState