favorites: implement a favorite list

The right panel can now store a favorite list which is
saved into a settings file in the user config directory.

Cargo.lock

@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9ecd88a8c8378ca913a680cd98f0f13ac67383d35993f86c90a70e3f137816b"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "anyhow"
 version = "1.0.44"
@@ -14,19 +29,56 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
+[[package]]
+name = "backtrace"
+version = "0.3.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "321629d8ba6513061f26707241fa9bc89524ff1cd7a915a97ef0c62c666ce1b6"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "base64"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "489d6c0ed21b11d038c31b6ceccca973e65d73ba3bd8ecb9a2babf5546164643"
+dependencies = [
+ "byteorder",
+ "safemem",
+]
+
+[[package]]
+name = "bitflags"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4efd02e230a02e18f92fc2735f44597385ed02ad8f831e7c1c1156ee5e1ab3a5"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
 [[package]]
 name = "cairo-rs"
 version = "0.14.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9164355c892b026d6257e696dde5f3cb39beb3718297f0f161b562fe2ee3ab86"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cairo-sys-rs",
  "glib",
  "libc",
@@ -44,6 +96,12 @@ dependencies = [
  "system-deps 3.2.0",
 ]
 
+[[package]]
+name = "cc"
+version = "1.0.72"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22a9137b95ea06864e018375b72adfb7db6e6f68cfc8df5a04d00288050485ee"
+
 [[package]]
 name = "cfg-expr"
 version = "0.8.1"
@@ -68,12 +126,49 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "dtoa"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
+
 [[package]]
 name = "either"
 version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "error-chain"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9435d864e017c3c6afeac1654189b06cdb491cf2ff73dbf0d73b0f292f42ff8"
+dependencies = [
+ "backtrace",
+]
+
+[[package]]
+name = "failure"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d32e9bd16cc02eae7db7ef620b392808b89f6a5e16bb3497d159c6b92a0f4f86"
+dependencies = [
+ "backtrace",
+ "failure_derive",
+]
+
+[[package]]
+name = "failure_derive"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa4da3c766cd7a0db8242e326e9e4e081edd567072893ed320008189715366a4"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
 [[package]]
 name = "field-offset"
 version = "0.3.4"
@@ -167,7 +262,7 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f97a162c17214d1bf981af3f683156a0b1667dd1927057c4f0a68513251ecf0f"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cairo-rs",
  "gdk-pixbuf",
  "gdk4-sys",
@@ -194,13 +289,19 @@ dependencies = [
  "system-deps 5.0.0",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.26.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78cc372d058dcf6d5ecd98510e7fbc9e5aec4d21de70f65fea8fecebcd881bd4"
+
 [[package]]
 name = "gio"
 version = "0.14.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "711c3632b3ebd095578a9c091418d10fed492da9443f58ebc8f45efbeb215cb0"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "futures-channel",
  "futures-core",
  "futures-io",
@@ -230,7 +331,7 @@ version = "0.14.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c515f1e62bf151ef6635f528d05b02c11506de986e43b34a5c920ef0b3796a4"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "futures-channel",
  "futures-core",
  "futures-executor",
@@ -308,7 +409,7 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eff59ca46c4fc5087fd7a0c3770a71ea4b6e94f8c24c12e2c2e8538f9f6fd764"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cairo-rs",
  "gdk4",
  "glib",
@@ -342,10 +443,12 @@ dependencies = [
  "glib",
  "gstreamer",
  "gtk4",
- "log",
+ "log 0.4.14",
  "once_cell",
+ "serde",
+ "serde_any",
  "x11",
- "xml-rs",
+ "xml-rs 0.8.4",
 ]
 
 [[package]]
@@ -354,7 +457,7 @@ version = "0.17.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c6a255f142048ba2c4a4dce39106db1965abe355d23f4b5335edea43a553faa4"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "futures-channel",
  "futures-core",
@@ -389,7 +492,7 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "58a04f421d1485ba4739e723199f5828bca05ab4e622ed39a96a342b6b1a6a3d"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cairo-rs",
  "field-offset",
  "futures-channel",
@@ -450,6 +553,17 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "idna"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
+dependencies = [
+ "matches",
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.1"
@@ -459,12 +573,39 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itoa"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b71991ff56294aa922b450139ee08b3bfc70982c6b2c7562771375cf73542dd4"
+
+[[package]]
+name = "itoa"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
+
 [[package]]
 name = "libc"
 version = "0.2.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd8f7255a17a627354f321ef0055d63b898c6fb27eff628af4d1b66b7331edf6"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
+
+[[package]]
+name = "log"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e19e8d5c34a3e0e2223db8e060f9e8264aeeb5c5fc64a4ee9965c062211c024b"
+dependencies = [
+ "log 0.4.14",
+]
+
 [[package]]
 name = "log"
 version = "0.4.14"
@@ -474,6 +615,18 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "matches"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
+
+[[package]]
+name = "memchr"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
+
 [[package]]
 name = "memoffset"
 version = "0.6.4"
@@ -483,6 +636,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "miniz_oxide"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a92518e98c078586bc6c934028adcca4c92a53d6a958196de835170a01d84e4b"
+dependencies = [
+ "adler",
+ "autocfg",
+]
+
 [[package]]
 name = "muldiv"
 version = "1.0.0"
@@ -519,6 +682,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "object"
+version = "0.27.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67ac1d3f9a1d3616fd9a60c8d74296f22406a238b6a72f5cc1e6f314df4ffbf9"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.8.0"
@@ -531,7 +703,7 @@ version = "0.14.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "546fd59801e5ca735af82839007edd226fe7d3bb06433ec48072be4439c28581"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "glib",
  "libc",
  "once_cell",
@@ -556,6 +728,12 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0744126afe1a6dd7f394cb50a716dbe086cb06e255e53d8d0185d82828358fb5"
 
+[[package]]
+name = "percent-encoding"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
+
 [[package]]
 name = "pest"
 version = "2.1.3"
@@ -596,7 +774,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ebace6889caf889b4d3f76becee12e90353f2b8c7d875534a71e5742f8f6f83"
 dependencies = [
  "thiserror",
- "toml",
+ "toml 0.5.8",
 ]
 
 [[package]]
@@ -641,6 +819,23 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "ron"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9fa11b7a38511d46ff1959ae46ebb60bd8a746f17bdd0206b4c8de7559ac47b"
+dependencies = [
+ "base64",
+ "bitflags 1.3.2",
+ "serde",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
+
 [[package]]
 name = "rustc_version"
 version = "0.3.3"
@@ -650,6 +845,18 @@ dependencies = [
  "semver",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
+
+[[package]]
+name = "safemem"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
+
 [[package]]
 name = "semver"
 version = "0.11.0"
@@ -673,6 +880,83 @@ name = "serde"
 version = "1.0.130"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f12d06de37cf59146fbdecab66aa99f9fe4f78722e3607577a5375d66bd0c913"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde-xml-any"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e281928a3e3104e809dbd19b78cef7ef7c29662cf2583a94c032485aa2e7586b"
+dependencies = [
+ "error-chain",
+ "log 0.3.9",
+ "serde",
+ "xml-rs 0.6.1",
+]
+
+[[package]]
+name = "serde_any"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cb506febacc2cf6533279947bd37b69ce91782af1aedf31c7e6181a77d46ee"
+dependencies = [
+ "failure",
+ "ron",
+ "serde",
+ "serde-xml-any",
+ "serde_json",
+ "serde_urlencoded",
+ "serde_yaml",
+ "toml 0.4.10",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.130"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7bc1a1ab1961464eae040d96713baa5a724a8152c1222492465b54322ec508b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcbd0344bc6533bc7ec56df11d42fb70f1b912351c0825ccb7211b59d8af7cf5"
+dependencies = [
+ "itoa 1.0.1",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "serde_urlencoded"
+version = "0.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "642dd69105886af2efd227f75a520ec9b44a820d65bc133a9131f7d229fd165a"
+dependencies = [
+ "dtoa",
+ "itoa 0.4.8",
+ "serde",
+ "url",
+]
+
+[[package]]
+name = "serde_yaml"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef8099d3df28273c99a1728190c7a9f19d444c941044f64adf986bee7ec53051"
+dependencies = [
+ "dtoa",
+ "linked-hash-map",
+ "serde",
+ "yaml-rust",
+]
 
 [[package]]
 name = "slab"
@@ -715,6 +999,18 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.12.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "unicode-xid",
+]
+
 [[package]]
 name = "system-deps"
 version = "3.2.0"
@@ -729,7 +1025,7 @@ dependencies = [
  "strum",
  "strum_macros",
  "thiserror",
- "toml",
+ "toml 0.5.8",
  "version-compare",
 ]
 
@@ -742,7 +1038,7 @@ dependencies = [
  "cfg-expr 0.9.0",
  "heck",
  "pkg-config",
- "toml",
+ "toml 0.5.8",
  "version-compare",
 ]
 
@@ -766,6 +1062,30 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "tinyvec"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c1c1d5a42b6245520c249549ec267180beaffcc0615401ac8e31853d4b6d8d2"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
+
+[[package]]
+name = "toml"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "toml"
 version = "0.5.8"
@@ -781,6 +1101,21 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
+[[package]]
+name = "unicode-bidi"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a01404663e3db436ed2746d9fefef640d868edae3cceb81c3b8d5732fda678f"
+
+[[package]]
+name = "unicode-normalization"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d54590932941a9e9266f0832deed84ebe1bf2e4c9e4a3554d393d18f5e854bf9"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.8.0"
@@ -793,6 +1128,17 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
+[[package]]
+name = "url"
+version = "1.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd4e7c0d531266369519a4aa4f399d748bd37043b00bde1e4ff1f60a120b355a"
+dependencies = [
+ "idna",
+ "matches",
+ "percent-encoding",
+]
+
 [[package]]
 name = "version-compare"
 version = "0.0.11"
@@ -837,8 +1183,26 @@ dependencies = [
  "pkg-config",
 ]
 
+[[package]]
+name = "xml-rs"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e1945e12e16b951721d7976520b0832496ef79c31602c7a29d950de79ba74621"
+dependencies = [
+ "bitflags 0.9.1",
+]
+
 [[package]]
 name = "xml-rs"
 version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]

Cargo.toml

@@ -14,3 +14,5 @@ log = "0.4.11"
 once_cell = "1.7.2"
 xml-rs = "0.8.4"
 x11 = { version = "2.18", features = ["xlib"] }
+serde = "1.0"
+serde_any = "0.5"

src/app.rs

@@ -19,11 +19,12 @@
 use glib::Value;
 use gtk::gdk::Rectangle;
 use gtk::prelude::*;
-use gtk::{gio, glib, graphene};
 use gtk::{
-    AboutDialog, Application, ApplicationWindow, Builder, Button, FileChooserAction,
+    gdk::BUTTON_SECONDARY, AboutDialog, Application, ApplicationWindow, Builder, Button,
-    FileChooserDialog, PopoverMenu, ResponseType, Statusbar, Viewport,
+    CellRendererText, FileChooserAction, FileChooserDialog, ListStore, PopoverMenu, ResponseType,
+    Statusbar, TreeView, TreeViewColumn, Viewport,
 };
+use gtk::{gio, glib, graphene};
 use once_cell::unsync::OnceCell;
 use std::cell::RefCell;
 use std::collections::HashMap;
@@ -32,6 +33,7 @@ use std::{error, ops};
 
 use crate::pipeline::{Pipeline, PipelineState};
 use crate::plugindialogs;
+use crate::settings::Settings;
 
 use crate::graphmanager::{GraphView, Node, PortDirection};
 
@@ -188,6 +190,109 @@ impl GPSApp {
         dialog.show();
     }
 
+    fn reset_favorite_list(&self, favorite_list: &TreeView) {
+        let model = ListStore::new(&[String::static_type()]);
+        favorite_list.set_model(Some(&model));
+        let favorites = Settings::get_favorites_list();
+        for favorite in favorites {
+            model.insert_with_values(None, &[(0, &favorite)]);
+        }
+    }
+
+    fn setup_favorite_list(&self) {
+        let favorite_list: TreeView = self
+            .builder
+            .object("favorites_list")
+            .expect("Couldn't get window");
+        let column = TreeViewColumn::new();
+        let cell = CellRendererText::new();
+
+        column.pack_start(&cell, true);
+        // Association of the view's column with the model's `id` column.
+        column.add_attribute(&cell, "text", 0);
+        column.set_title("favorites");
+        favorite_list.append_column(&column);
+        self.reset_favorite_list(&favorite_list);
+        let app_weak = self.downgrade();
+        favorite_list.connect_row_activated(move |tree_view, _tree_path, _tree_column| {
+            let app = upgrade_weak!(app_weak);
+            let selection = tree_view.selection();
+            if let Some((model, iter)) = selection.selected() {
+                let element_name = model
+                    .get(&iter, 0)
+                    .get::<String>()
+                    .expect("Treeview selection, column 1");
+                println!("{}", element_name);
+                app.add_new_element(&element_name);
+            }
+        });
+        let gesture = gtk::GestureClick::new();
+        gesture.set_button(0);
+        let app_weak = self.downgrade();
+        gesture.connect_pressed(
+            glib::clone!(@weak favorite_list => move |gesture, _n_press, x, y| {
+                let app = upgrade_weak!(app_weak);
+                if gesture.current_button() == BUTTON_SECONDARY {
+                    let selection = favorite_list.selection();
+                    if let Some((model, iter)) = selection.selected() {
+                        let element_name = model
+                        .get(&iter, 0)
+                        .get::<String>()
+                        .expect("Treeview selection, column 1");
+                        println!("{}", element_name);
+                        let point = graphene::Point::new(x as f32,y as f32);
+
+
+                    let pop_menu: PopoverMenu = app
+                        .builder
+                        .object("fav_pop_menu")
+                        .expect("Couldn't get menu model for favorites");
+
+                    pop_menu.set_pointing_to(&Rectangle {
+                        x: point.to_vec2().x() as i32,
+                        y: point.to_vec2().y() as i32,
+                        width: 0,
+                        height: 0,
+                    });
+                    // add an action to delete link
+                    let action = gio::SimpleAction::new("favorite.remove", None);
+                    let app_weak = app.downgrade();
+                    action.connect_activate(glib::clone!(@weak pop_menu => move |_,_| {
+                        let app = upgrade_weak!(app_weak);
+                        Settings::remove_favorite(&element_name);
+                        app.reset_favorite_list(&favorite_list);
+                        pop_menu.unparent();
+                    }));
+                    if let Some(application) = app.window.application() {
+                        application.add_action(&action);
+                    }
+
+                    pop_menu.show();
+                    }
+
+                }
+            }),
+        );
+        favorite_list.add_controller(&gesture);
+    }
+
+    fn add_to_favorite_list(&self, element_name: String) {
+        let favorites = Settings::get_favorites_list();
+        if !favorites.contains(&element_name) {
+            let favorite_list: TreeView = self
+                .builder
+                .object("favorites_list")
+                .expect("Couldn't get window");
+            if let Some(model) = favorite_list.model() {
+                let list_store = model
+                    .dynamic_cast::<ListStore>()
+                    .expect("Could not cast to ListStore");
+                list_store.insert_with_values(None, &[(0, &element_name)]);
+                Settings::add_favorite(&element_name);
+            }
+        }
+    }
+
     pub fn build_ui(&self, application: &Application) {
         let drawing_area_window: Viewport = self
             .builder
@@ -430,6 +535,17 @@ impl GPSApp {
                         width: 0,
                         height: 0,
                     });
+
+                    let action = gio::SimpleAction::new("node.add-to-favorite", None);
+                    let app_weak = app.downgrade();
+                    action.connect_activate(glib::clone!(@weak pop_menu => move |_,_| {
+                        let app = upgrade_weak!(app_weak);
+                        println!("node.delete {}", node_id);
+                        let node = app.graphview.borrow().node(&node_id).unwrap();
+                        app.add_to_favorite_list(node.name());
+                        pop_menu.unparent();
+                    }));
+                    application.add_action(&action);
                     let action = gio::SimpleAction::new("node.delete", None);
                     let app_weak = app.downgrade();
                     action.connect_activate(glib::clone!(@weak pop_menu => move |_,_| {
@@ -479,6 +595,9 @@ impl GPSApp {
                 }),
             )
             .expect("Failed to register node-right-clicked signal of graphview");
+
+        // Setup the favorite list
+        self.setup_favorite_list();
     }
 
     // Downgrade to a weak reference
@@ -489,11 +608,11 @@ impl GPSApp {
     // Called when the application shuts down. We drop our app struct here
     fn drop(self) {}
 
-    pub fn add_new_element(&self, element_name: String) {
+    pub fn add_new_element(&self, element_name: &str) {
         let graph_view = self.graphview.borrow_mut();
         let node_id = graph_view.next_node_id();
-        let pads = Pipeline::pads(&element_name, false);
+        let pads = Pipeline::pads(element_name, false);
-        if Pipeline::element_is_uri_src_handler(&element_name) {
+        if Pipeline::element_is_uri_src_handler(element_name) {
             GPSApp::get_file_from_dialog(self, false, move |app, filename| {
                 println!("Open file {}", filename);
                 let node = app.graphview.borrow().node(&node_id).unwrap();
@@ -504,11 +623,7 @@ impl GPSApp {
         }
         graph_view.add_node_with_port(
             node_id,
-            Node::new(
+            Node::new(node_id, element_name, Pipeline::element_type(element_name)),
-                node_id,
-                &element_name,
-                Pipeline::element_type(&element_name),
-            ),
             pads.0,
             pads.1,
         );

src/gps.ui

@@ -36,6 +36,14 @@
       </item>
       </section>
   </menu>
+  <menu id="fav_menu">
+    <section>
+      <item>
+        <attribute name="label" translatable="yes" comments="favorite menu entry delete the favorite">_Remove favorite</attribute>
+        <attribute name="action">app.favorite.remove</attribute>
+      </item>
+      </section>
+  </menu>
   <menu id="node_menu">
     <section>
       <item>
@@ -60,6 +68,11 @@
         <attribute name="action">app.node.properties</attribute>
         <attribute name="accel">&lt;primary&gt;n</attribute>
       </item>
+      <item>
+          <attribute name="label" translatable="yes" comments="Node menu entry add to favorite">_Add to favorite</attribute>
+          <attribute name="action">app.node.add-to-favorite</attribute>
+          <attribute name="accel">&lt;primary&gt;A</attribute>
+      </item>
     </section>
   </menu>
 
@@ -68,7 +81,11 @@
     <property name="authors">Stéphane Cerveau</property>
     <property name="hide-on-close">True</property>
   </object>
-
+  <object class="GtkAdjustment" id="scale_adjustment">
+    <property name="upper">100</property>
+    <property name="step-increment">1</property>
+    <property name="page-increment">10</property>
+  </object>
   <object class="GtkDialog" id="dialog-plugin-list">
   <property name="transient-for">mainwindow</property>
     <property name="default-width">320</property>
@@ -195,12 +212,14 @@
                 </child>
               </object>
             </child>
-            <child>
+          </object>
-              <object class="GtkScale">
+        </child>
-                <property name="draw-value">1</property>
+        <child>
-                <property name="round-digits">1</property>
+          <object class="GtkScale" id="scale-position">
-              </object>
+            <property name="visible">True</property>
-            </child>
+            <property name="can-focus">True</property>
+            <property name="adjustment">scale_adjustment</property>
+            <property name="round-digits">1</property>
           </object>
         </child>
         <child>
@@ -227,12 +246,12 @@
                 <property name="hexpand">True</property>
                 <property name="vexpand">True</property>
                 <property name="child">
-                  <object class="GtkTreeView">
+                  <object class="GtkTreeView" id="favorites_list">
-                    <child>
+                   <child>
-                      <object class="GtkTreeViewColumn">
+                  <object class="GtkPopoverMenu" id="fav_pop_menu">
-                        <property name="title" translatable="yes">column</property>
+                    <property name="menu-model">fav_menu</property>
-                      </object>
+                  </object>
-                    </child>
+                  </child>
                   </object>
                 </property>
               </object>

src/main.rs

@@ -24,6 +24,7 @@ mod common;
 mod graphmanager;
 mod pipeline;
 mod plugindialogs;
+mod settings;
 use gtk::prelude::*;
 
 use crate::app::GPSApp;

src/plugindialogs.rs

@@ -106,16 +106,11 @@ pub fn display_plugin_list(app: &GPSApp, elements: &[ElementInfo]) {
                 let app = upgrade_weak!(app_weak);
                 let selection = tree_view.selection();
                 if let Some((model, iter)) = selection.selected() {
-                    // Now getting back the values from the row corresponding to the
-                    // iterator `iter`.
-                    //
-
                     let element_name = model
                     .get(&iter, 1)
                     .get::<String>()
                     .expect("Treeview selection, column 1");
-                    println!("{}", element_name);
+                    app.add_new_element(&element_name);
-                    app.add_new_element(element_name);
                 }
             }),
         );

src/settings.rs

@@ -0,0 +1,86 @@
+use std::fs::create_dir_all;
+use std::path::PathBuf;
+
+use serde::{Deserialize, Serialize};
+
+use crate::common;
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct Settings {
+    pub favorites: Vec<String>,
+}
+
+impl Settings {
+    fn settings_file_exist() {
+        let s = Settings::get_settings_file_path();
+
+        if !s.exists() {
+            if let Some(parent_dir) = s.parent() {
+                if !parent_dir.exists() {
+                    if let Err(e) = create_dir_all(parent_dir) {
+                        println!(
+                            "Error while trying to build settings snapshot_directory '{}': {}",
+                            parent_dir.display(),
+                            e
+                        );
+                    }
+                }
+            }
+        }
+    }
+
+    fn get_settings_file_path() -> PathBuf {
+        let mut path = glib::user_config_dir();
+        path.push(common::APPLICATION_NAME);
+        path.push("settings.toml");
+        path
+    }
+
+    // Public methods
+    pub fn add_favorite(favorite: &str) {
+        let mut settings = Settings::load_settings();
+        settings.favorites.sort();
+        settings.favorites.push(String::from(favorite));
+        Settings::save_settings(&settings);
+    }
+
+    pub fn remove_favorite(favorite: &str) {
+        let mut settings = Settings::load_settings();
+        settings.favorites.retain(|x| x != favorite);
+        Settings::save_settings(&settings);
+    }
+
+    pub fn get_favorites_list() -> Vec<String> {
+        let mut favorites = Vec::new();
+        let settings = Settings::load_settings();
+        for fav in settings.favorites {
+            favorites.push(fav);
+        }
+        favorites
+    }
+
+    // Save the provided settings to the settings path
+    pub fn save_settings(settings: &Settings) {
+        Settings::settings_file_exist();
+        let s = Settings::get_settings_file_path();
+        if let Err(e) = serde_any::to_file(&s, settings) {
+            println!("Error while trying to save file: {} {}", s.display(), e);
+        }
+    }
+
+    // Load the current settings
+    pub fn load_settings() -> Settings {
+        let s = Settings::get_settings_file_path();
+        if s.exists() && s.is_file() {
+            match serde_any::from_file::<Settings, _>(&s) {
+                Ok(s) => s,
+                Err(e) => {
+                    println!("Error while opening '{}': {}", s.display(), e);
+                    Settings::default()
+                }
+            }
+        } else {
+            Settings::default()
+        }
+    }
+}