Dopesheet: Added "Moving Hold" as a keyframe type

Currently "long keyframes" are only useful for indicating where stationary
holds occur. If however you try to create a "moving hold" (where the values
are slightly different, but in terms of overall effect, it's still a hold)
then it could get tricky to keep track of where these occur.

Now it's possible to tag such keyframes (using the keyframe types - RKEY)
as being part of a moving hold. These will not only be drawn differently
from normal keyframes, but they will also result in a "long keyframe"
being drawn between each pair of them, just like if they had been completely
stationary instead.

Currently the theming/styling of these is a bit rough. They reuse the existing
theme colours for long keyframes.

3 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_keyframes_draw.h b/source/blender/editors/include/ED_keyframes_draw.h
index 43264a6edaa..b1f3f012e09 100644
--- a/source/blender/editors/include/ED_keyframes_draw.h
+++ b/source/blender/editors/include/ED_keyframes_draw.h
@@ -80,7 +80,7 @@ typedef struct ActKeyBlock {
 	
 	/* key-block info */
 	char sel;
-	short handle_type;
+	short flag;
 	float val;
 	float start, end;
 	
@@ -89,6 +89,12 @@ typedef struct ActKeyBlock {
 	short totcurve; 
 } ActKeyBlock;
 
+/* ActKeyBlock - Flag */
+typedef enum eActKeyBlock_Flag {
+	/* Key block represents a moving hold */
+	ACTKEYBLOCK_FLAG_MOVING_HOLD     = (1 << 0),
+} eActKeyBlock_Flag;
+
 /* *********************** Keyframe Drawing ****************************** */
 
 /* options for keyframe shape drawing */
diff --git a/source/blender/editors/include/UI_icons.h b/source/blender/editors/include/UI_icons.h
index 2c80701bf69..d85b60dcc43 100644
--- a/source/blender/editors/include/UI_icons.h
+++ b/source/blender/editors/include/UI_icons.h
@@ -1020,6 +1020,7 @@ DEF_VICO(KEYTYPE_KEYFRAME_VEC)
 DEF_VICO(KEYTYPE_BREAKDOWN_VEC)
 DEF_VICO(KEYTYPE_EXTREME_VEC)
 DEF_VICO(KEYTYPE_JITTER_VEC)
+DEF_VICO(KEYTYPE_MOVING_HOLD_VEC)
 
 DEF_VICO(COLORSET_01_VEC)
 DEF_VICO(COLORSET_02_VEC)
diff --git a/source/blender/editors/include/UI_resources.h b/source/blender/editors/include/UI_resources.h
index dc843952229..a81221ed54b 100644
--- a/source/blender/editors/include/UI_resources.h
+++ b/source/blender/editors/include/UI_resources.h
@@ -347,6 +347,8 @@ void    UI_GetThemeColorShade3ubv(int colorid, int offset, unsigned char col[3])
 
 // get four color values, scaled to 0.0-1.0 range
 void    UI_GetThemeColor4fv(int colorid, float col[4]);
+// get four color values, range 0.0-1.0, complete with shading offset for the RGB components
+void    UI_GetThemeColorShade4fv(int colorid, int offset, float col[4]);
 
 // get the 3 or 4 byte values
 void UI_GetThemeColor3ubv(int colorid, unsigned char col[3]);