diff --git a/Cargo.lock b/Cargo.lock
index 69ba7fe..2acddd0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -26,9 +26,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.32"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b602bfe940d21c130f3895acd65221e8a61270debe89d628b9cb4e3ccb8569b"
+checksum = "a1fd36ffbb1fb7c834eac128ea8d0e310c5aeb635548f9d58861e1308d46e71c"
 
 [[package]]
 name = "atk"
@@ -139,9 +139,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.60"
+version = "1.0.61"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef611cc68ff783f18535d77ddd080185275713d852c4f5cbb6122c462a7a825c"
+checksum = "ed67cbde08356238e75fc4656be4749481eeffb09e19f320a25237d5221c985d"
 
 [[package]]
 name = "cfg-if"
@@ -239,12 +239,12 @@ dependencies = [
 
 [[package]]
 name = "ctor"
-version = "0.1.15"
+version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39858aa5bac06462d4dd4b9164848eb81ffc4aa5c479746393598fd193afa227"
+checksum = "7fbaabec2c953050352311293be5c6aba8e141ba19d6811862b232d6fd020484"
 dependencies = [
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -259,13 +259,13 @@ dependencies = [
 
 [[package]]
 name = "derive_more"
-version = "0.99.10"
+version = "0.99.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dcfabdab475c16a93d669dddfc393027803e347d09663f524447f642fbb84ba"
+checksum = "41cb0e6161ad61ed084a36ba71fbba9e3ac5aee3606fb607fe08da6acbcf3d8c"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -338,7 +338,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -396,15 +396,15 @@ checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
 
 [[package]]
 name = "futures"
-version = "0.1.29"
+version = "0.1.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b980f2816d6ee8673b6517b52cb0e808a180efc92e5c19d02cdda79066703ef"
+checksum = "4c7e4c2612746b0df8fed4ce0c69156021b704c9aefa360311c04e6e9e002eed"
 
 [[package]]
 name = "futures"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e05b85ec287aac0dc34db7d4a569323df697f9c55b99b15d6b4ef8cde49f613"
+checksum = "5d8e3078b7b2a8a671cb7a3d17b4760e4181ea243227776ba83fd043b4ca034e"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -417,9 +417,9 @@ dependencies = [
 
 [[package]]
 name = "futures-channel"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f366ad74c28cca6ba456d95e6422883cfb4b252a83bed929c83abfdbbf2967d5"
+checksum = "a7a4d35f7401e948629c9c3d6638fb9bf94e0b2121e96c3b428cc4e631f3eb74"
 dependencies = [
  "futures-core",
  "futures-sink",
@@ -427,9 +427,9 @@ dependencies = [
 
 [[package]]
 name = "futures-core"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59f5fff90fd5d971f936ad674802482ba441b6f09ba5e15fd8b39145582ca399"
+checksum = "d674eaa0056896d5ada519900dbf97ead2e46a7b6621e8160d79e2f2e1e2784b"
 
 [[package]]
 name = "futures-cpupool"
@@ -437,15 +437,15 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"
 dependencies = [
- "futures 0.1.29",
+ "futures 0.1.30",
  "num_cpus",
 ]
 
 [[package]]
 name = "futures-executor"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10d6bb888be1153d3abeb9006b11b02cf5e9b209fda28693c31ae1e4e012e314"
+checksum = "cc709ca1da6f66143b8c9bec8e6260181869893714e9b5a490b169b0414144ab"
 dependencies = [
  "futures-core",
  "futures-task",
@@ -454,42 +454,42 @@ dependencies = [
 
 [[package]]
 name = "futures-io"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de27142b013a8e869c14957e6d2edeef89e97c289e69d042ee3a49acd8b51789"
+checksum = "5fc94b64bb39543b4e432f1790b6bf18e3ee3b74653c5449f63310e9a74b123c"
 
 [[package]]
 name = "futures-macro"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0b5a30a4328ab5473878237c447333c093297bded83a4983d10f4deea240d39"
+checksum = "f57ed14da4603b2554682e9f2ff3c65d7567b53188db96cb71538217fc64581b"
 dependencies = [
  "proc-macro-hack",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
 name = "futures-sink"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f2032893cb734c7a05d85ce0cc8b8c4075278e93b24b66f9de99d6eb0fa8acc"
+checksum = "0d8764258ed64ebc5d9ed185cf86a95db5cac810269c5d20ececb32e0088abbd"
 
 [[package]]
 name = "futures-task"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bdb66b5f09e22019b1ab0830f7785bcea8e7a42148683f99214f73f8ec21a626"
+checksum = "4dd26820a9f3637f1302da8bceba3ff33adbe53464b54ca24d4e2d4f1db30f94"
 dependencies = [
  "once_cell",
 ]
 
 [[package]]
 name = "futures-util"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8764574ff08b701a084482c3c7031349104b07ac897393010494beaa18ce32c6"
+checksum = "8a894a0acddba51a2d49a6f4263b1e64b8c579ece8af50fa86503d52cd1eea34"
 dependencies = [
  "futures-channel",
  "futures-core",
@@ -588,7 +588,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fb60242bfff700772dae5d9e3a1f7aa2e4ebccf18b89662a16acb2822568561"
 dependencies = [
  "bitflags",
- "futures 0.3.5",
+ "futures 0.3.6",
  "futures-channel",
  "futures-core",
  "futures-io",
@@ -647,7 +647,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -749,9 +749,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.9.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00d63df3d41950fb462ed38308eea019113ad1508da725bbedcd0fa5a85ef5f7"
+checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
 
 [[package]]
 name = "heck"
@@ -764,9 +764,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.16"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c30f6d0bc6b00693347368a67d41b58f2fb851215ff1da49e90fe2c5c667151"
+checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
 dependencies = [
  "libc",
 ]
@@ -797,7 +797,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55e2e4c765aa53a0424761bf9f41aa7a6ac1efa87238f59560640e27fca028f2"
 dependencies = [
  "autocfg",
- "hashbrown 0.9.0",
+ "hashbrown 0.9.1",
 ]
 
 [[package]]
@@ -889,9 +889,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.77"
+version = "0.2.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2f96b10ec2560088a8e76961b00d47107b3a625fecb76dedb29ee7ccbf98235"
+checksum = "2448f6066e80e3bfc792e9c98bf705b4b0fc6e8ef5b43e5889aff0eaa9c58743"
 
 [[package]]
 name = "lock_api"
@@ -1225,7 +1225,7 @@ dependencies = [
  "proc-macro-hack",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1239,22 +1239,22 @@ dependencies = [
 
 [[package]]
 name = "pin-project"
-version = "0.4.23"
+version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca4433fff2ae79342e497d9f8ee990d174071408f28f726d6d83af93e58e48aa"
+checksum = "2ffbc8e94b38ea3d2d8ba92aea2983b503cd75d0888d75b86bb37970b5698e15"
 dependencies = [
  "pin-project-internal",
 ]
 
 [[package]]
 name = "pin-project-internal"
-version = "0.4.23"
+version = "0.4.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c0e815c3ee9a031fdf5af21c10aa17c573c9c6a566328d99e3936c34e36461f"
+checksum = "65ad2ae56b6abe3a1ee25f15ee605bacadb9a764edaba9c2bf4103800d4a1895"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1315,7 +1315,7 @@ dependencies = [
  "proc-macro-error-attr",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
  "version_check",
 ]
 
@@ -1344,9 +1344,9 @@ checksum = "eba180dafb9038b050a4c280019bbedf9f2467b61e5d892dcad585bb57aadc5a"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.21"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36e28516df94f3dd551a587da5357459d9b36d945a7c37c3557928c1c2ff2a2c"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
 dependencies = [
  "unicode-xid 0.2.1",
 ]
@@ -1446,7 +1446,7 @@ checksum = "7d21b475ab879ef0e315ad99067fa25778c3b0377f57f1b00207448dac1a3144"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1509,7 +1509,7 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8bd49c2044efea26d613a5a38d53c2148b378ba0c5bd297c1d056b4555401b9b"
 dependencies = [
- "futures 0.1.29",
+ "futures 0.1.30",
  "futures-cpupool",
  "log 0.3.9",
  "tokio-core",
@@ -1559,7 +1559,7 @@ checksum = "f630a6370fd8e457873b4bd2ffdae75408bc291ba72be773772a4c2a065d9ae8"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1603,9 +1603,9 @@ checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
 [[package]]
 name = "structopt"
-version = "0.3.17"
+version = "0.3.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6cc388d94ffabf39b5ed5fadddc40147cb21e605f53db6f8f36a625d27489ac5"
+checksum = "a7a7159e7d0dbcab6f9c980d7971ef50f3ff5753081461eeda120d5974a4ee95"
 dependencies = [
  "clap",
  "lazy_static",
@@ -1614,15 +1614,15 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.10"
+version = "0.4.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e2513111825077552a6751dfad9e11ce0fba07d7276a3943a037d7e93e64c5f"
+checksum = "8fc47de4dfba76248d1e9169ccff240eea2a4dc1e34e309b95b2393109b4b383"
 dependencies = [
  "heck",
  "proc-macro-error",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1640,7 +1640,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1656,9 +1656,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.41"
+version = "1.0.44"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6690e3e9f692504b941dc6c3b188fd28df054f7fb8469ab40680df52fdcc842b"
+checksum = "e03e57e4fcbfe7749842d53e24ccb9aa12b7252dbe5e91d2acad31834c8b8fdd"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
@@ -1723,22 +1723,22 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7dfdd070ccd8ccb78f4ad66bf1982dc37f620ef696c6b5028fe2ed83dd3d0d08"
+checksum = "318234ffa22e0920fe9a40d7b8369b5f649d490980cf7aadcf1eb91594869b42"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
+checksum = "cae2447b6282786c3493999f40a9be2a6ad20cb8bd268b0a0dbf5a065535c0ab"
 dependencies = [
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
@@ -1757,7 +1757,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "mio",
  "num_cpus",
  "tokio-codec",
@@ -1781,7 +1781,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "25b2998660ba0e70d18684de5d06b70b70a3a747469af9dea7618cc59e75976b"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "tokio-io",
 ]
 
@@ -1792,7 +1792,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aeeffbbb94209023feaef3c196a41cbcdafa06b4a6f893f68779bb5e53796f71"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "iovec",
  "log 0.4.11",
  "mio",
@@ -1810,7 +1810,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1de0e32a83f131e002238d7ccde18211c0a5397f60cbfffcb112868c2e0e20e"
 dependencies = [
- "futures 0.1.29",
+ "futures 0.1.30",
  "tokio-executor",
 ]
 
@@ -1821,7 +1821,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fb2d1b8f4548dbf5e1f7818512e9c406860678f29c300cdf0ebac72d1a3a1671"
 dependencies = [
  "crossbeam-utils",
- "futures 0.1.29",
+ "futures 0.1.30",
 ]
 
 [[package]]
@@ -1830,7 +1830,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "297a1206e0ca6302a0eed35b700d292b275256f596e2f3fea7729d5e629b6ff4"
 dependencies = [
- "futures 0.1.29",
+ "futures 0.1.30",
  "tokio-io",
  "tokio-threadpool",
 ]
@@ -1842,7 +1842,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57fc868aae093479e3131e3d165c93b1c7474109d13c90ec0dda2a1bbfff0674"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "log 0.4.11",
 ]
 
@@ -1853,7 +1853,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09bc590ec4ba8ba87652da2068d150dcada2cfa2e07faae270a5e0409aa51351"
 dependencies = [
  "crossbeam-utils",
- "futures 0.1.29",
+ "futures 0.1.30",
  "lazy_static",
  "log 0.4.11",
  "mio",
@@ -1872,7 +1872,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "edfe50152bc8164fcc456dab7891fa9bf8beaf01c5ee7e1dd43a397c3cf87dee"
 dependencies = [
  "fnv",
- "futures 0.1.29",
+ "futures 0.1.30",
 ]
 
 [[package]]
@@ -1882,7 +1882,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98df18ed66e3b72e742f185882a9e201892407957e45fbff8da17ae7a7c51f72"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "iovec",
  "mio",
  "tokio-io",
@@ -1898,7 +1898,7 @@ dependencies = [
  "crossbeam-deque",
  "crossbeam-queue",
  "crossbeam-utils",
- "futures 0.1.29",
+ "futures 0.1.30",
  "lazy_static",
  "log 0.4.11",
  "num_cpus",
@@ -1913,7 +1913,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "93044f2d313c95ff1cb7809ce9a7a05735b012288a888b62d4434fd58c94f296"
 dependencies = [
  "crossbeam-utils",
- "futures 0.1.29",
+ "futures 0.1.30",
  "slab",
  "tokio-executor",
 ]
@@ -1925,7 +1925,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2a0b10e610b39c38b031a2fcab08e4b82f16ece36504988dcbd81dbba650d82"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "log 0.4.11",
  "mio",
  "tokio-codec",
@@ -1940,7 +1940,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ab57a4ac4111c8c9dbcf70779f6fc8bc35ae4b2454809febac840ad19bd7e4e0"
 dependencies = [
  "bytes",
- "futures 0.1.29",
+ "futures 0.1.30",
  "iovec",
  "libc",
  "log 0.4.11",
@@ -1953,9 +1953,9 @@ dependencies = [
 
 [[package]]
 name = "toml"
-version = "0.5.6"
+version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"
+checksum = "75cf45bb0bef80604d001caaec0d09da99611b3c0fd39d3080468875cdb65645"
 dependencies = [
  "serde",
 ]
@@ -1980,7 +1980,7 @@ dependencies = [
  "proc-macro-hack",
  "proc-macro2",
  "quote 1.0.7",
- "syn 1.0.41",
+ "syn 1.0.44",
 ]
 
 [[package]]
diff --git a/src/widgets/widget_definitions.rs b/src/widgets/widget_definitions.rs
index 58e9d2b..0dc17a3 100644
--- a/src/widgets/widget_definitions.rs
+++ b/src/widgets/widget_definitions.rs
@@ -7,7 +7,10 @@ use anyhow::*;
 use gtk::prelude::*;
 use gtk::ImageExt;
 use maplit::hashmap;
+use std::cell::RefCell;
+use std::fmt;
 use std::path::Path;
+use std::rc::Rc;
 
 use gdk_pixbuf;
 
@@ -49,6 +52,16 @@ pub(super) fn resolve_widget_attrs(bargs: &mut BuilderArgs, gtk_widget: &gtk::Wi
         })
     }
 
+    let on_scroll_handler: Rc<RefCell<Option<Box<dyn Fn(ScrollDir)>>>> = Rc::new(RefCell::new(None));
+    gtk_widget.add_events(gdk::EventMask::SCROLL_MASK);
+    gtk_widget.add_events(gdk::EventMask::SMOOTH_SCROLL_MASK);
+    gtk_widget.connect_scroll_event(glib::clone!(@strong on_scroll_handler => move |_, evt| {
+        if let Some(ref handler) = *on_scroll_handler.borrow() {
+            handler(if evt.get_delta().1 < 0f64 {ScrollDir::Up } else {ScrollDir::Down});
+        }
+        gtk::Inhibit(false)
+    }));
+
     resolve_block!(bargs, gtk_widget, {
         prop(class:   as_string) { gtk_widget.get_style_context().add_class(&class) },
         prop(valign:  as_string) { gtk_widget.set_valign(parse_align(&valign)?) },
@@ -64,6 +77,16 @@ pub(super) fn resolve_widget_attrs(bargs: &mut BuilderArgs, gtk_widget: &gtk::Wi
             gtk_widget.reset_style();
             css_provider.load_from_data(format!("* {{ {} }}", style).as_bytes())?;
             gtk_widget.get_style_context().add_provider(&css_provider, gtk::STYLE_PROVIDER_PRIORITY_APPLICATION)
+        },
+        prop(onscroll: as_string) {
+            on_scroll_handler.replace(Some(Box::new(move |evt| run_command(&onscroll, evt))));
+        },
+        prop(onhover: as_string) {
+            gtk_widget.add_events(gdk::EventMask::ENTER_NOTIFY_MASK);
+            gtk_widget.connect_enter_notify_event(move |_, evt| {
+                run_command(&onhover, format!("{} {}", evt.get_position().0, evt.get_position().1));
+                gtk::Inhibit(false)
+            });
         }
     });
 }
@@ -83,6 +106,7 @@ pub(super) fn resolve_range_attrs(bargs: &mut BuilderArgs, gtk_widget: &gtk::Ran
         prop(max         : as_f64)    { gtk_widget.get_adjustment().set_upper(max)},
         prop(orientation : as_string) { gtk_widget.set_orientation(parse_orientation(&orientation)?) },
         prop(onchange    : as_string) {
+            // TODO FIX: if this is loaded by a varref, and changes, the value _must_ be disconnected.
             gtk_widget.connect_value_changed(move |gtk_widget| {
                 run_command(&onchange, gtk_widget.get_value());
             });
@@ -113,7 +137,10 @@ fn build_gtk_scale(bargs: &mut BuilderArgs) -> Result<gtk::Scale> {
 fn build_gtk_button(bargs: &mut BuilderArgs) -> Result<gtk::Button> {
     let gtk_widget = gtk::Button::new();
     resolve_block!(bargs, gtk_widget, {
-        prop(onclick: as_string) { gtk_widget.connect_clicked(move |_| run_command(&onclick, "")); }
+        prop(onclick: as_string) {
+            // TODO FIX: if this is loaded by a varref, and changes, the value _must_ be disconnected.
+            gtk_widget.connect_clicked(move |_| run_command(&onclick, ""));
+        }
     });
     Ok(gtk_widget)
 }
@@ -227,3 +254,18 @@ fn connect_first_map<W: IsA<gtk::Widget>, F: Fn(&W) + 'static>(widget: &W, func:
         }
     });
 }
+
+#[derive(Debug, Eq, PartialEq)]
+pub enum ScrollDir {
+    Up,
+    Down,
+}
+
+impl fmt::Display for ScrollDir {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            ScrollDir::Up => write!(f, "up"),
+            ScrollDir::Down => write!(f, "down"),
+        }
+    }
+}