added changealpha function

1 files changed, 24 insertions, 0 deletions

diff --git a/x.c b/x.c
index 6b74bc1..18237ef 100644
--- a/x.c
+++ b/x.c
@@ -55,6 +55,7 @@ static void clipcopy(const Arg *);
 static void clippaste(const Arg *);
 static void numlock(const Arg *);
 static void selpaste(const Arg *);
+static void changealpha(const Arg *);
 static void zoom(const Arg *);
 static void zoomabs(const Arg *);
 static void zoomreset(const Arg *);
@@ -166,6 +167,7 @@ static void xsetenv(void);
 static void xseturgency(int);
 static int evcol(XEvent *);
 static int evrow(XEvent *);
+static float clamp(float, float, float);
 
 static void expose(XEvent *);
 static void visibility(XEvent *);
@@ -299,6 +301,18 @@ numlock(const Arg *dummy)
 }
 
 void
+changealpha(const Arg *arg)
+{
+    if((alpha > 0 && arg->f < 0) || (alpha < 1 && arg->f > 0))
+        alpha += arg->f;
+    alpha = clamp(alpha, 0.0, 1.0);
+    alphaUnfocused = clamp(alpha-alphaOffset, 0.0, 1.0);
+
+    xloadcols();
+    redraw();
+}
+
+void
 zoom(const Arg *arg)
 {
 	Arg larg;
@@ -351,6 +365,15 @@ evrow(XEvent *e)
 	return y / win.ch;
 }
 
+float
+clamp(float value, float lower, float upper) {
+    if(value < lower)
+        return lower;
+    if(value > upper)
+        return upper;
+    return value;
+}
+
 void
 mousesel(XEvent *e, int done)
 {
@@ -2228,6 +2251,7 @@ run:
 	cols = MAX(cols, 1);
 	rows = MAX(rows, 1);
 	defaultbg = MAX(LEN(colorname), 256);
+	alphaUnfocused = alpha-alphaOffset;
 	tnew(cols, rows);
 	xinit(cols, rows);
 	xsetenv();