Set*UIColor, etc.

The inseparable changes necessary to support live color updating across the
system in a sane, safe, and performant manner.

BView gains:

HasSystemColors()
HasDefaultColors()
AdoptSystemColors()
AdoptParentColors()
AdoptViewColor(BView*)
SetViewUIColor(color_which, float tint)
SetHighUIColor(...
SetLowUIColor(...
ViewUIColor(float* tint)
HighUIColor(...
LowUIColor(...
DelayedInvalidate()

BWindow gains a simple helper method:
IsOffscreenWindow()

BMessage gains:

AddColor()
FindColor()
GetColor()
HasColor()            * allegedly this API is deprecated, but I implemented it anyway
ReplaceColor()
SetColor()

Previous private ColorTools methods are made public and moved into GraphicsDefs:

mix_color, blend_color, disable_color

These are fully compatible with BeOS dan0 R5.1 methods and are just code cleanup
of BeOS example code under the OpenTracker license.

In addition, four new colors are created:
B_LINK_TEXT_COLOR
B_LINK_HOVER_COLOR
B_LINK_ACTIVE_COLOR
B_LINK_VISITED_COLOR

These changes are documented in their proper user documentation files.

In addition, due to a history rewrite, B_FOLLOW_LEFT_TOP has been defined and
used in lieu of B_FOLLOW_TOP | B_FOLLOW_LEFT and is included in this commit.

On the app_server side, the following has changed:

Add DelayedMessage - a system by which messages can be sent at a scheduled time,
and can also be merged according to set rules.  A single thread is used to service the
message queue and multiple recipients can be set for each message.
Desktop gains the ability to add message ports to a DelayedMessage so that
said messages can target either all applications or all windows, as needed.

Desktop maintains a BMessage which is used to queue up all pending color changes
and the delayed messaging system is used to enact these changes after a short
period of time has passed.  This prevents abuse and allows the system to merge
repeated set_ui_color events into one event for client applications, improving
performance drastically.

In addition, B_COLORS_UPDATED is sent to the BApplication, which forwards the message
to each BWindow.  This is done to improve performance over having the app_server
independently informing each window.

Decorator changes are live now, which required some reworking.

Signed-off-by: Augustin Cavalier <[email protected]>

src/servers/app/DesktopSettings.cpp

@@ -1,11 +1,12 @@
 /*
- * Copyright 2005-2013, Haiku.
+ * Copyright 2005-2015, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
  *		Stephan Aßmus <[email protected]>
  *		Axel Dörfler, [email protected]
  *		Andrej Spielmann, <[email protected]>
+ *		Joseph Groover <[email protected]>
  */
 
 
@@ -297,7 +298,10 @@ DesktopSettingsPrivate::_Load()
 				snprintf(colorName, sizeof(colorName), "color%" B_PRId32,
 					(int32)index_to_color_which(i));
 
-				settings.FindInt32(colorName, (int32*)&fShared.colors[i]);
+				if (settings.FindInt32(colorName, (int32*)&fShared.colors[i]) != B_OK) {
+					// Set obviously bad value so the Appearance app can detect it
+					fShared.colors[i] = B_TRANSPARENT_COLOR;
+				}
 			}
 		}
 	}
@@ -647,12 +651,16 @@ DesktopSettingsPrivate::WorkspacesMessage(int32 index) const
 
 
 void
-DesktopSettingsPrivate::SetUIColor(color_which which, const rgb_color color)
+DesktopSettingsPrivate::SetUIColor(color_which which, const rgb_color color,
+									bool* changed)
 {
 	int32 index = color_which_to_index(which);
 	if (index < 0 || index >= kColorWhichCount)
 		return;
 
+	if (changed != NULL)
+		*changed = fShared.colors[index] != color;
+
 	fShared.colors[index] = color;
 	// TODO: deprecate the background_color member of the menu_info struct,
 	// otherwise we have to keep this duplication...
@@ -663,6 +671,47 @@ DesktopSettingsPrivate::SetUIColor(color_which which, const rgb_color color)
 }
 
 
+void
+DesktopSettingsPrivate::SetUIColors(const BMessage& colors, bool* changed)
+{
+	int32 count = colors.CountNames(B_RGB_32_BIT_TYPE);
+	if (count <= 0)
+		return;
+
+	int32 index = 0;
+	int32 colorIndex = 0;
+	char* name = NULL;
+	type_code type;
+	rgb_color color;
+	color_which which = B_NO_COLOR;
+
+	while (colors.GetInfo(B_RGB_32_BIT_TYPE, index, &name, &type) == B_OK) {
+		which = which_ui_color(name);
+		colorIndex = color_which_to_index(which);
+		if (colorIndex < 0 || colorIndex >= kColorWhichCount
+			|| colors.FindColor(name, &color) != B_OK) {
+			if (changed != NULL)
+				changed[index] = false;
+
+			++index;
+			continue;
+		}
+
+		if (changed != NULL)
+			changed[index] = fShared.colors[colorIndex] != color;
+
+		fShared.colors[colorIndex] = color;
+
+		if (which == (int32)B_MENU_BACKGROUND_COLOR)
+			fMenuInfo.background_color = color;
+
+		++index;
+	}
+
+	Save(kAppearanceSettings);
+}
+
+
 rgb_color
 DesktopSettingsPrivate::UIColor(color_which which) const
 {
@@ -977,9 +1026,9 @@ LockedDesktopSettings::SetShowAllDraggers(bool show)
 
 
 void
-LockedDesktopSettings::SetUIColor(color_which which, const rgb_color color)
+LockedDesktopSettings::SetUIColors(const BMessage& colors, bool* changed)
 {
-	fSettings->SetUIColor(which, color);
+	fSettings->SetUIColors(colors, &changed[0]);
 }