From 305a7c2a22b02dde982f1b9fa60db6d277a3bc91 Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg@phi-gamma.net>
Date: Fri, 19 Aug 2022 07:47:25 +0200
Subject: edit: implement basic insert mode switch
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Where <i> or <CR> enter “insert mode” (i. e. activate the Edit
widget) and <Esc> leaves it again.
---
 src/edit.rs | 70 +++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 47 insertions(+), 23 deletions(-)

diff --git a/src/edit.rs b/src/edit.rs
index de0fa80..016ed9a 100644
--- a/src/edit.rs
+++ b/src/edit.rs
@@ -17,6 +17,7 @@ slint::slint! {
         callback format-rgb-component(int) -> string;
         callback color-of-rgb-component(string, int) -> color;
         callback component-of-rgb(string, color) -> int;
+        property<bool> insert-mode: false;
     }
 
     Colors := Rectangle {
@@ -98,8 +99,10 @@ slint::slint! {
 
     Edit := Rectangle {
         width        : 100%;
-        border-width : 2px;
-        background: @linear-gradient(90deg, #002b36 0%, #073642 100%);
+        background   : @linear-gradient(90deg, #002b36 0%, #073642 100%);
+        border-color : Aux.insert-mode ? #cb4b16 : #839496;
+        border-width : 3px;
+
         property<color> rgb : Colors.white;
 
         callback update (color);
@@ -136,33 +139,48 @@ slint::slint! {
         key-inputs := FocusScope {
             key-pressed(event) => {
                 debug("input: got", event.text, "shift?", event.modifiers.shift);
-                if (event.text == "q") {
-                    user-quit();
-                }
-                if (event.text == "h") {
-                    debug("select prev");
-                    master.select-prev();
-                }
-                else if (event.text == "l") {
-                    debug("select next");
-                    master.select-next();
+                /* Escape always gets you back to normal mode. */
+                if (event.text == Keys.Escape) {
+                    debug("enter normal");
+                    master.enter-normal-mode();
                 }
-                else if (event.text == "	") {
-                    if (event.modifiers.shift) {
+                else if (Aux.insert-mode) {
+                    /* In insert mode, most selection bindings are frozen. */
+                } /* Insert mode. */
+                else {
+                    /* Normal mode bindings. */
+                    if (event.text == "q") {
+                        user-quit();
+                    }
+                    if (event.text == "h") {
                         debug("select prev");
                         master.select-prev();
-                    } else {
+                    }
+                    else if (event.text == "l") {
                         debug("select next");
                         master.select-next();
                     }
-                }
-                else if (event.text == "j" || event.text == "k") {
-                    debug("select other row");
-                    master.select-other-row();
-                }
-                if (event.modifiers.control) {
-                    //debug("control was pressed during this event");
-                }
+                    else if (event.text == "	") {
+                        if (event.modifiers.shift) {
+                            debug("select prev");
+                            master.select-prev();
+                        } else {
+                            debug("select next");
+                            master.select-next();
+                        }
+                    }
+                    else if (event.text == "j" || event.text == "k") {
+                        debug("select other row");
+                        master.select-other-row();
+                    }
+                    else if (event.text == Keys.Return || event.text == "i") {
+                        debug("enter insert");
+                        master.enter-insert-mode();
+                    }
+                    if (event.modifiers.control) {
+                        //debug("control was pressed during this event");
+                    }
+                } /* Normal mode. */
                 edit.update(
                     Aux.selected < 8
                         ? primary-colors.colors   [Aux.selected]
@@ -192,6 +210,9 @@ slint::slint! {
             callback select-next();
             callback select-other-row();
 
+            callback enter-insert-mode();
+            callback enter-normal-mode();
+
             select-prev () => {
                 Aux.select (Aux.selected == 0 ? 15 : Aux.selected - 1);
                 debug ("selected previous, now", Aux.selected);
@@ -207,6 +228,9 @@ slint::slint! {
                 debug ("selected row above/below, now", Aux.selected);
             }
 
+            enter-normal-mode () => { Aux.insert-mode = false; }
+            enter-insert-mode () => { Aux.insert-mode = true; }
+
             status := HorizontalBox {
                 width : 100%;
 
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